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Problem: Furnace Air Conditioner Heat Pump Works Intermittently.

furnacecartoon2

Problem: We have had this question asked many times. My furnace, air conditioner, heat pump works intermittently? Why does my furnace, air conditioner, or heat pump work sometimes, and then sometimes it will not work at all? If I flip the switch on the furnace several times or turn the breaker off and on the furnace, air conditioner, or heat pump will work a few times then it is back to the same problem of not wanting to start and come on? What could cause this problem to happen? Sometimes it works and sometimes it does not work? 

Answer: Thanks for asking this question. We have many people who have this problem with the intermittent furnace, air conditioner, heat pump, and air handler operation and I can say that most of the time I have found the problem to be either loose, burnt wire connections, or internal relays in control boards (need a new control board) that are pitted and worn out. Sometimes the relays, contactor, sequencer will make contact (complete the circuit), and sometimes it arcs and will not complete the circuit.  Below we have a picture of a relay that came off a control board with the black box cover removed. This picture is courtesy of AC Service Tech.  If your furnace starts sometimes and then will not start sometimes then it could be caused by a bad relay on the control board. You will probably need a new control board to fix the problem. If your furnace’s draft inducer, blower motor, or ignitor will not start then this could be a bad or worn-out draft inducer relay, blower motor fan relay, or ignitor relay on the control board. Always check with a volt-meter to make sure that the control board is getting power between L1 and neutral. Make sure all wire connections are tight.  Also, make sure that all your safety controls are closed with the draft inducer running. Safety controls would be the limit, all rollout switches, and the pressure switch. Always make sure that if your thermostat uses batteries that the batteries are in good condition.  Below we have an excellent video that explains Intermittent Faults on HVAC Units that include furnaces, air conditioners, heat pumps, and air handlers. Thanks so very much to AC Service Tech for making this excellent video.  I hope this helps you out. If you have any questions please comment below or email us anytime at arnoldservice@gmail.com

If you would like for us to look up parts then please send your furnace or air conditioner’s model number to arnoldservice@gmail.com and we will be glad to help you find and look up parts. We Would Love to Try and Help You Out and Help You Solve Your HVAC Problem! 

control board relay defective
control board relay defective

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Problem: My blower motor shaft is stuck to the blower wheel! How do I get the blower motor out to replace it?

struggling with removing a blower motor

Problem: My blower motor shaft is stuck to the blower wheel! How do I get the blower motor out to replace it?

Answer: I have had this problem before many times when I was trying to replace furnace blower motors! The blower wheel is stuck to the blower motor shaft and in order to replace the blower motor, you need to get the blower wheel separated from the blower motor! Here are the steps that I used many times to remove the blower motor from the blower wheel. We have two really good YouTube videos below made by Word of Advice TV that show how to remove a stubborn blower wheel from the blower motor and another video made by HVAC Parts and More that shows How to Replace a blower motor, wheel, and blower housing on a Lennox furnace. Many thanks to Word of Advice TV and HVAC Parts and More for making these excellent videos. Here are the steps that I use to remove the blower wheel from the motor. When I used these steps I never had to use a mechanical wheel puller.

(1) Loosened the set screw and oil the shaft with penetrating oil.

(2) Sand the shaft with light emery cloth sandpaper. Make sure there is no rust or high metal gouges in the motor shaft.  If there are high spots or marks in the motor shaft then a file might be needed to file the high spots down on the motor shaft.

(3) Remove the usually 3 of 4 motor mounting bolts that are holding the motor to the blower housing.

(4) Sit in a chair and open my legs and knees far apart so the motor can fall to the ground when the motor becomes free from the motor shaft.  If you do not feel comfortable with placing the motor housing in between your legs then place the blower housing between two sawhorses so that the motor can fall out after you beat the shaft through the blower wheel hole. Place a pillow or something soft so you do not damage the motor brackets or damage the floor when the motor comes loose from the wheel.

(5) Get a 3/8″ long extension and a hammer to beat the motor shaft out of the blower wheel. The 3/8″ extension will fit through the blower wheel shaft hole. The motor should fall out. Be careful not to get hit with the falling blower motor. It can be hard on the toes and legs!  If the blower motor does not come loose from the blower wheel after several hits then you might need to purchase a blower wheel puller like in the YouTube video. If the shaft on the motor becomes mushroomed then you will need to file the mushroom down with a file. I hope you have good luck and can get it off.  If you have any questions or recommendations then please email us anytime or comment below. Our email is arnoldservice@gmail.comWe would love to try and help you out! 


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Question: Why does my heat pump smell musty when it defrosts? What is Dirty Sock Syndrome?

dirty sock syndrome 1

Question: Why does my heat pump smell musty when it defrosts? What is Dirty Sock Syndrome? 

Answer: We have had several people ask us this question including myself! I do not want anyone to continue to have this awful smell in their home so that is why I am writing this post. I installed a new packaged heat pump unit at my house in the Spring of 2021. Everything was going swell and dandy until this fall when the new heat pump started having to defrost to melt the ice off the unit. My wife said, “What in the world is that terrible smell??? It smells like soured laundry clothes!” You know when you forget to place the laundry in the dryer for several days and the clothes go sour!  Yes! It was a terrible smell that lasted while our heat pump was defrosting and for about 20 minutes after the defrost stopped! I asked myself how could this be happening with a brand new heat pump packaged unit??? How can this happen with new equipment??? Is it something that I did wrong in the installation?? I started thinking about how heat pumps defrosts and it makes sense how this smell can occur. I first Googled the subject, “Dirty Sock Syndrome” and found the following definition: “Dirty sock syndrome occurs when your heat pump goes into defrost mode, which stirs up microorganisms and leads to a foul smell. … Then when the heat pump goes into defrost mode, the indoor coil cools down and becomes moist, which reactivates the microorganisms.” I told myself that this problem makes sense on how it can continue to occur when the heat pump defrosts! The heat pump system switches the hot outdoor condenser coil (summertime) with the indoor evaporator coil in the wintertime. During the summertime, we do not have the dirty sock syndrome smell because the heat pump unit’s indoor coil is always cold, but in the wintertime when the heat pump has to defrost the hot indoor coil goes into air conditioning mode which makes the indoor coil cool, cold and the coil collects moisture. During the defrost cycle which usually lasts 10 to 15 minutes the indoor cool cold coil is accumulating water and moisture from your home’s indoor air. When the heat pump cycles back to the heating mode the cool, cold coil is immediately heated up which burns off and evaporates the water, moisture along with funky smelling dirt and bacteria off the indoor evaporator which produces the dirty sock odor! Yes, that makes sense, but how do I eliminate this problem? I have researched this and unfortunately, there really does not seem to be a long-term solution. Many people have temporarily stopped the problem by having the coil cleaned with a special cleaner every year like the dirty sock coil cleaner that we sell on the following page: Please click here if you are interested in the Dirty Sox coil cleaner that we sell. Some have installed Ultraviolet UV lamps to kill mode and bacteria on the coils. Please click here if you are interested in the UV lights we sell. 

I have just had Cataract surgery and have not been able to clean the coil on our heat pump yet. I will let you all know if the Dirty Sox spray coil cleaner that we sell works or not when I get the doctor’s OK to lift heavy objects again! What I have been doing with our heat pump on cold nights (when the outdoor temp is below 32 degrees) is that  I place the heat pump thermostat on “Emergency Heat” which cuts the outdoor heat pump off and heats our home off all electric heat. Lucky it has not been that cold yet here in Kentucky, but it is a lot better than having that awful dirty sock smell in our home! I am sure I will see how my emergency heat move has affected our next electric bill! LOL! I probably will not be laughing we I see our electric bill!

I found a really good article about how to fix Dirty Sock Syndrome from https://www.yourmodernfamily.com/dirty-sock-syndrome-cleaner/ 

On YourModernFamily.com they discuss how to get rid of the Dirty Sock Syndrome. They have found great results using special coil cleaners that I have pictured below.

dirty Sock Syndrome Cleaner solutions
dirty Sock Syndrome Cleaner solutions

If you want to learn how the defrost on a heat pump works then we have an excellent YouTube video below where AC Service Tech LLC explains how a heat pump defrost works. Thanks to AC Service Tech LLC for making this excellent video! I hope this information helps you understand what causes Dirty Sock Syndrome and how to get rid of Dirty Sock Syndrome! If you have any questions please comment below or email us anytime at arnoldservice@gmail.com We would love to try and help you out! 

Comstar Dirty Sock Spray
Comstar Dirty Sock Spray


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Problem: How can I tell the difference between the Trane 80 Volt IGN00145 ignitor and the 120 Volt IGN00152 ignitor?

happy furnace

Problem: How can I tell the difference between the Trane, American Standard 80-Volt IGN00145 ignitor and the 120-Volt IGN00152 ignitor?

Answer: This answer is directed to showing the difference between the 80-volt IGN00145 and the 120-volt IGN00152 Trane, American Standard ignitors. We have this question asked many times because it is hard to determine which ignitor is installed on some of the Trane furnaces. Some people have asked us, “Could I have the wrong ignitor installed in my furnace? My IGN00145 ignitor is going out quite often?”  If you have a new Trane furnace then you probably have the IGN00152 ignitor. If you have an older furnace that does not have a new control board KIT installed then you probably have the older 80 volt IGN00145 or IGN00117 ignitor installed. The easiest way to find out the difference is to measure your old ignitor and compare the measurements with the pictures below. You could also email me, Steve Arnold with your furnace’s model number and I will be glad to look it up and see which ignitor that Trane and American Standard recommend. Our email is arnoldservice@gmail.com We Would Love to Help You Out and Earn Your Business! Please click here if you are interested in going to the page where we sell the IGN00145 ignitor. Please click here if you are interested in going to the page where we sell the IGN00152 ignitor. 

We also have a conversion adapter wire that we sell that converts the IGN00145 to the IGN00152 ignitor. Please click here if you are interested in seeing the conversion wire adapter we sell.  If you have any questions please email us anytime: arnoldservice@gmail.com. I hope this post helps you out.  Thanks for reading!

Ign00145 length of black ignitor
Above on the IGN00145 ignitor, the length of the black ignitor is approximately 1 5/8″ long. Much longer than the IGN00152.
ign00152 length of ignitor
Above on the IGN00152 ignitor, the length of the black ignitor is approximately 3/4″ long. Much shorter than the IGN00145.

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Problem: How can I find my run capacitor size and voltage if the ratings are worn off?

rusty capacitor

Problem: My air conditioner’s fan and compressor have stopped working! My capacitor looks bad. Really bad and rusty all over! I can not read the specifications on the capacitor to know which capacitor to purchase. How can I find out what size capacitor that I need for my condenser fan and compressor?

worn out capacitors

Answer: We have this question asked many times. I have had this problem several times when I was doing air conditioning service. The Air conditioning unit’s capacitor needs to be replaced, but the capacitor is so rusty or the label is missing! I have had to ask myself, how in the world do I determine what is the right capacitor replacement size when I can not read the specifications of the old capacitor?  We have a really good YouTube video below that was made by AC Service Tech LLC that explains how to determine the right capacitor size when the capacitor specifications are worn off. Thanks to the AC Service Tech Channel for making this great video! AC Service tech explains in the video that you can get the capacitor size for the motor off the motor label and the compressor capacitor size by using Google or another search engine to find the compressor model number and capacitor size. The two most popular compressor manufacturers are Copeland and Bristol. Please click here if you would like to see a PDF Copeland Compressor Product Guide that shows the capacitor sizes for many of the Copeland compressors. Please click here if you would like to see a PDF Bristol Compressor Product Guide that shows the capacitor sizes for many of the Bristol Compressors. If you need a capacitor we would love to help you out! We sell over 80 different name-brand capacitors on the following page: Please click here to see the capacitors we sell. If you have any questions or if you would like for us to look up a capacitor or part for your AC or furnace please send us your unit’s model number and we will be glad to try and help you out. Our email is arnoldservice@gmail.com


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Question: Can I wire my gas furnace up to run off a generator in an emergency situation?

generator with power cord

Question: Can I wire my gas furnace up to run off a generator in an emergency situation? My home and family need heat! It is below zero outside!

Disclaimer: Arnold’s Service Company, Inc. assumes no liability for any incidental, consequential, or other liability from the use of this information. All risks and damages, incidental or otherwise, arising from the use or misuse of the information contained herein are entirely the responsibility of the user. Although careful precaution has been taken in the preparation of this website’s information, we assume no responsibility for omissions or errors.

Answer:  We have this question asked quite often since we are in the wintertime ice storm season! The answer is, “Yes!” You can run your gas furnace off of a generator to get the heat for your family and for your home! I have hooked our generator up to our Bryant 90I furnace before to get temporary heat for our home.  It was a lifesaver and that is why I wanted to add this post on how to do it on our site.  I have step-by-step instructions below, but if you do not like reading then we have a really good YouTube video made by David Vermullen on, “Hooking up a gas furnace to a generator” below. Thanks to Mr. Vermullen for taking the time to make this excellent informative video! Here is my step by step instructions:

  1. Tools needed: screwdriver, electrical tape, wire stripper, wire nuts, heavy-duty extension cord, 2000 watt minimum generator, voltmeter to make sure power is turned off and make sure generator is producing enough voltage. The generator should produce at least 110 volts AC with the furnace running.
  2. Make sure that the power to the furnace is turned off at the breaker box in case the power is restored while you are working on the furnace’s wiring! When the electric company restores power you will of course turn the generator off, disconnect the extension cord, reconnect the power wires to the furnace using your home’s power source then turn the breaker back on.  Always test with a volt-meter to make sure the power is off when working with electricity. Hopefully, you have the individual breaker marked for the furnace in your breaker box so you will know which breaker turns the furnace power off and on.  If you do not have the breaker marked then I would recommend turning all your home’s breakers off to make sure the power does not come on while you are wiring your furnace to the generator. I would suggest making sure that the furnace’s wall thermostat is turned off as well.  I would suggest turning the thermostat off or way down because you do not want the furnace to come on until you have the power hooked up and running with the generator. 
  3.  Make sure the power is turned off to the furnace by testing with a voltmeter.
  4. Remove the junction box cover plate that covers the power switch for the furnace with a screwdriver.
  5. Remove the power switch and connect the wires from the extension cord (white and black) to the two power wires that go into the furnace using wire nuts.  You would connect the white wire from your extension cord to the white neutral wire of your furnace. You would connect the black wire (power wire) from your extension cord to the black power wire of your furnace. Use electrical tape to wrap wire nuts so they do not come off. Wire nut or tape off the bare wires that come from your home’s power source to the furnace because you do not want live wires exposed when the power company restores power to your home. Make sure that the furnace’s blower door is installed because many furnaces have blower door safety switches that cut off power to the furnace if the blower door has been removed.
  6. Plug the heavy-duty extension cord into the generator power source with the generator running. Make sure that the generator is running outdoors. Never run a generator indoors to prevent carbon monoxide poisoning. 
  7. Turn up the thermostat and hopefully see the furnace start and fire up. Congratulations! Fantastic! Awesome! 

An important note: This should work on most gas furnaces that have one transformer systems (most furnaces do).  If you have a system that has two low voltage transformers one on the indoor furnace and one on the outdoor unit then this might not work. It still might work with a two transformer system but the low voltage wiring would need to be investigated to see if the furnace’s transformer is used for heating. If the outdoor unit’s transformer is used for heating then it would not work because with this power set up the furnace would not be getting low voltage to make the furnace run.  In other words, if the outdoor unit (Air Conditioner) has a low voltage transformer that is used to control the heat then this will not work because the outdoor unit requires 220 volts to power the outdoor transformer. If you have any questions please email me anytime at arnoldservice@gmail.com or comment below. We would love to help you out and earn your business! 

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Question: What are the best furnace and air conditioning systems that you would recommend?

hvac brand name logos

Question: What are the best furnace and air conditioning systems that you would recommend? What brand name furnaces and air conditioners do you see the least amount of problems.

Answer: I have this question asked hundreds of times since we started our HVAC business in 1988! This is a great question! In my experience over the many years doing service work, I like the Trane, American Standard, Bryant, Carrier, Heil, and ICP units the best. I will not say that the other brand names are bad, but the Trane, American Standard, Bryant, Carrier, Heil, and ICP are the brand names that I installed and serviced the most.  These brand names are the brands where I had the least number of service calls and problems.  I could clearly see and feel that these brands were constructed with heavy-duty long-lasting materials and components. They just felt and looked well made. The metal was thicker. I would recommend Trane, American Standard, Bryant, Carrier, Heil, and ICP brand name furnaces and air conditioners. Trane and American Standard would be my top choices. I must add this important note: I would highly recommend that you get a licensed HVAC contractor to install your new equipment. Make sure that your contractor does a heat gain, heat loss calculation (manual J) calculation so you know that you are getting the right size furnace and air conditioner installed. Make sure that your contractor gets a permit from your local Housing Department so that you are getting a legal safe inspected HVAC installation and you will not have problems if you ever have an insurance claim or try and sell your home. I found a really good HVAC Load Calculator on the following page if you want to do some load calculations yourself. I also found a really good YouTube video, below that was made by Jay from Word of Advice TV. This video thoroughly explains what Jay found in Consumer Reports Magazine for the best HVAC, name brand equipment. Consumer Reports surveyed over 20,000 homeowners about their experiences with their HVAC equipment.  Thanks so much to Word of Advice TV for making this excellent video! Below the video, I have notes that I took from the video about the Consumer Reports survey. I have the brand names broken down with the companies they represent below. I hope that this helps you out when you need to purchase a new heating and air conditioning system. I sure did learn a lot from this video! Please let us know if you have any questions in the comments below or by emailing us at arnoldservice@gmail.com. We Would Love to Help You Out and Earn Your Business! 

Consumer Reports 5 Brands They Would Not Recommend:

  • Coleman
  • Frigidaire
  • Luxaire
  • Maytag
  • York

Consumer Reports 5 Brands They Would Recommend:

  • Lennox
  • American Standard
  • Trane
  • Carrier
  • Bryant

Brand Names Produced and Owned by United Technologies:

  • Carrier
  • Bryant
  • Payne
  • Day & Night
  • ICP
  • Arcoaire
  • Keeprite
  • Heil
  • Tempstar
  • Comfortmaker

Brand Names Produced and Owned by Lennox International:

  • Lennox
  • Ducane
  • Armstrong
  • Concord
  • Allied
  • Air-Ease
  • Air-Flo

Brand Names Produced and Owned by Rheem Manufacturing:

  • Rheem
  • Ruud

Brand Names Produced and Owned by Daikin Global: 

  • Daikin
  • Goodman
  • Amana
  • Janitrol

Brand Names Produced and Owned by Johnson Controls: 

  • York
  • Luxaire
  • Coleman

Brand Names Produced and Owned by Ingersoll Rand:

  • American Standard
  • Trane

Brand Names Produced and Owned by Nortek Global HVAC:

  • Frigidaire
  • Maytag

Brand Names Produced and Owned by WolfSteel:

  • Napoleon
  • Continental

We hope this helps you out in making a decision on purchasing the right equipment for your home.

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Problem: Why does my furnace go off on limit so much? Why do I have to replace my furnace limit switch so often?

hh12zb260 limit

Problem: Why does my furnace go off on limit so much? Why do I have to replace my furnace limit switch so often?

Answer: I have noticed this year more than any other year that we are having many questions about this problem. We are selling lots of furnace limit switches. The sales are great, but I have to be concerned about why all these customers are having to replace so many limit switches? A gas furnace that is maintained and adjusted properly should rarely go off on limit unless there is a serious problem with the furnace! The limit is a safety control that prevents the furnace from overheating. If your furnace is going off on limit then this means your furnace is overheating beyond normal.  I would highly recommend that you find out why the furnace is overheating and get this problem corrected. Here are some areas that you can check if your furnace is going off on high limit:

  1. You could have a blower motor that has failed to start or is slow in running.  You might need a new blower motor.  In many cases, a new capacitor or changing the blower speed might eliminate the furnace going off on high limit.  If you think you need a new capacitor please click here to see the capacitors that we sell.  If you would like to know how to change the speed on your blower motor then there is a really good YouTube video on this subject made by AC Service Tech. Please click here if you would like to see the YouTube video on how to change blower motor speeds. 
  2. You could have a dirty obstructed furnace filter. The furnace is not getting enough air and the heat exchanger overheats causing the furnace limit to open and stop the gas from burning to prevent a fire or damage to the furnace.  I am sure that you know it is important to change furnace filters on a regular basis.
  3. You could have a dirty furnace blower wheel. If the blower wheel is dirty the wheel can not pick up enough air to keep the furnace from overheating. We have a picture below that shows a dirty blower wheel. As you can see this wheel is not going to pick up much air!

dirty blower wheel

4. You could have a dirty or stopped up evaporator coil. If the underside (on an up-flow furnace) Air conditioner coil is stopped up with lint or dirt then this will cause the furnace to overheat and go off on limit. The furnace can not get rid of the heated air so the heat builds up and the furnace goes off on limit. A stopped-up evaporator coil hurts the furnace and air conditioner’s efficiency a lot. Make sure that your evaporator coil is not stopped up so air can easily flow through the evaporator coil. We have a post about cleaning evaporator coils on the following page: Please click here if you are interested in seeing how to clean an evaporator coil.

dirty evaporator ac coil
Above is a Picture of a Partially Stopped Up Evaporator Coil:

5. You could have obstructed returns or supply registers. Make sure that all returns are not obstructed with furniture or stopped up with dirt. Make sure all the supply registers are open.

6. You could have the gas valve adjusted too high where the gas input from the gas valve is producing too much heat for the furnace to handle. Please click here if you would like to see our post on how to adjust gas valve pressure. 

7. Last but not least. You might not have the recommended temperature rise on your furnace. Every furnace should have a label that shows what the recommended temperature rise is for the furnace. If the furnace is adjusted to the manufacturer’s recommended temperature rise then the furnace should not be going off on high limit.

We have three really good YouTube videos below that explain what temperature rise is and how to troubleshoot if your temperature rise is not within the recommended range that is set by the furnace manufacturer. The first YouTube is a 2-minute tutorial that explains what temperature rise is by Tom Kleinman. Thanks to Mr. Kleinman for making this information easy to understand in a video! The next video shows how to measure temperature rise on a furnace. You do not have to have a digital temperature meter like in the video. A low-cost thermometer could be used to measure the temperature rise in your furnace. This 3-minute video is by Lennox Learning Solutions. The third video shows the top 4 reasons why a furnace short cycles by AC Service Tech LLC.  Many thanks to AC Service Tech for making this great video! If you have any questions please email me, Steve Arnold, or comment below. Our email is arnoldservice@gmail.com.  I will be happy to try and answer any questions that you have. God bless you all! Thanks so much for reading our post and visiting our site! We Would Love to Help You Out and Earn Your Business! 



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Question: How do I clean the burners on my gas furnace?

upshot furnace burner

Question: My furnace burners do not light all the way across. The farthest burner from the gas valve will not light unless I cycle the furnace multiple times to warm up the furnace. Would cleaning the burners help?  How do I clean the burners on my gas furnace? Do you have any other suggestions for fixing my furnace?

Answer:  It sounds like your problem could be caused by dirty burners or not having enough gas pressure. I would suggest that you try to clean the burners by blowing them out with compressed air if you have an air compressor. There are 4 main burner types that are shown below :

  1. The Inshot burners are the most common and popular burners used today.  The Inshot burners are used on many 80% and 90% furnaces. The Inshot burner can not be used on a 70% furnace. upshot furnace burner
inshot burner closeup
Above Inshot Burner Closeup:

2. The Upshot burners are seen on many of the really old furnaces. Most of the time they are made of cast iron.

3. Ribbon burners or Stamped Steel burners. This type of burner is found on many of the older 70% name brands. Many of the older furnaces like Bryant, Carrier, York, Trane, Lennox, Ruud, and Rheem have ribbon, stamped steel burners.

ribbon burner

Make sure that you were eye protection and a dust mask if you decide to use compressed air to clean your burners. I have seen dust, rust and dirt go everywhere when using compressed air. If you are in a place where you can not use compressed air indoors a home then I would like to suggest turning the power and gas off to the furnace then taking the burners out and using compressed air outside the home. I find it best to use a wire brush and a vacuum to clean the burners. I have used both methods with and without compressed air with success. The compressed air method seems to clean the burner better. We have a really good YouTube video made by Word of Advice TV below that shows how to clean gas furnace burners. We also have a really good YouTube video that shows the different types of gas furnace burners. This video is made by Grayfurnaceman. If after cleaning the burners you still have problems then if you want you could try adjusting the gas pressure up a little bit. I would not recommend turning the gas regulator up over 1/4 turn at a time before testing. Be ready to turn the power switch off to the furnace if the furnace has delayed ignition for more than a second or two. We have a really good YouTube video made by AC Service Tech that tells how to adjust the natural gas pressure on a gas furnace. If you still have problems you might try cleaning the flame sensor. We have a post about this on the following page:  Click here if you are interested in how to clean a gas furnace flame sensor and how to troubleshoot a flame sensor.  I hope this helps you out. If you have any questions please let me know by emailing me or commenting below. Our email is arnoldservice@gmail.com We would love to help you out and earn your business! Steve



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Problem: How do I check to see if I have a bad furnace gas valve or a bad control board?

happy furnace

Problem: My gas furnace’s draft inducer starts, the furnace ignitor glows but the furnace never gets a gas flame. Do I have a control board problem or do I have a gas valve problem? I have checked my pressure switch and the pressure switch is closing when the draft inducer is on. How can I test the gas valve and control board to see which part is at fault?

Answer: Thanks for asking this question. First, I would recommend that you test to make sure all your safety controls are closed and the safety controls are allowing electricity to flow through them. The safety controls would be the pressure switch, which you have already tested, the rollout switches, and the limit switch. If any of the safety controls are open then the furnace will not operate. We have a really good post and Youtube video on testing safety controls on the following page: https://arnoldservice.com/problem-how-do-i-test-my-gas-furnace-rollout-switch-limit-switch-pressure-switch-and-flame-sensor/ I would like to suggest that you make sure that the gas valve and the furnace’s gas cock are turned on. If you have an LP furnace make sure that the LP tank is actually filled well enough. Make sure that if your thermostat has batteries that the batteries are in good condition.  We have two really good YouTube videos below made by Gray Furnace Man that show how to test gas valves to see if the gas valve is getting power or not. If the gas valve is getting power and not opening then you more than likely have a gas valve problem. If the gas valve is not getting any power when it is supposed to be getting power to open then more than likely you have a control board problem.  Below are two great YouTube videos that explain how to test a gas valve with a clamp-on meter and how to test a gas valve with meter probes. Thanks so very much to Gray Furnace Man for making these videos! If you have any questions please comment below or email us at arnoldservice@gmail.com. We hope this helps you solve and fix your furnace problem. 

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