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How do I tell if my gas furnace’s inducer motor is bad?

Problem: I turned my thermostat up to try and get my heat to come on and nothing happens! My furnace’s draft inducer will not start. After 30 seconds to a minute, I get a flash code on my control board that shows, “Pressure Switch Failed to Close”

Answer: We have this question asked quite often. The first component of the furnace that should start up after the thermostat is turned up to call for heat is the draft inducer. It might be necessary to tape your furnace’s safety door switch closed temporarily so you can test the furnace’s control board with a voltmeter. Test with a voltmeter on your furnace’s control board to make sure you are getting 24 to 28 volts AC between the W and C (com) thermostat wires that come from the thermostat. If you are not getting 24 volts between W and C (com) then you either have a thermostat problem, a thermostat wire problem, the thermostat might not be turned on heating or turned up, you could have a low voltage transformer problem or a blown fuse on the control board. Make sure that the batteries in your thermostat are in good condition. If you are getting 24 volts between W and C (com) and the draft inducer is not coming on then please watch the following really good YouTube video made by AC Service Tech LLC. Craig Migliaccio on “How to tell if a draft inducer motor is bad”.  Please click here if you would like to see many air conditioning and heating videos made by AC Service Tech. I believe these are the best HVAC Repair Videos on the Internet! I hope this post will help you in finding and fixing your furnace problem! If you have any questions please comment below or email me, Steve Arnold at Support@arnoldservice.com. Thank you so much for your time and support with our website!  

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Gas Furnace Sequence of Operation is Important to Know!

This excellent Youtube Video made by AC Service Tech LLC that explains why it is important to know the Gas furnace sequence of operation when troubleshooting furnaces.  If one sequence of operation does not occur then as a troubleshooter you can focus on the sequence that is missing and fix the problem.  Thanks so very much to Craig Migliaccio for taking the time to make this excellent video! I have the sequence of operation below. The YouTube video illustrates the sequence of operation on a Bryant Carrier 92% condensing furnace.  The proper sequence of operation is:

  1. The thermostat calls for heat by the home owner (you) turning the thermostat up.
  2. The thermostat provides 24 volts to the W terminal on the control board. When you check with a voltmeter you should have 24 volts AC (alternating current) between W and C (com) on the control board.
  3. The control board sends 110-125 volts AC to the draft inducer to start the draft inducer.
  4. If the vent and combustion chamber are open then the pressure switch closes the connection between the two wires that go into the pressure switch. If the furnace pressure switch, limit and rollout switches are all closed (allowing current to run through them) then the control board starts the furnace ignition sequence.
  5. The control board sends power to the furnace ignitor which should glow bright orange for a set number of seconds. Usually 15 to 30 seconds. During the set time that the ignitor is glowing the control board sends 24 to 28 volts AC to the gas valve to open the gas valve allowing gas to flow and the gas burners to ignite (start burning). If the gas burners do not ignite in 5 to 8 seconds the flame sensor does not sense the flame and the control board turns the gas valve off. FYI-If this happens you might need to clean your flame sensor or replace your flame sensor. Please click here if you are interested in the flame sensors we sell. If the flame sensor does sense the flame the control board sends 24 volts to the gas valve and the gas burners continue to burn until the thermostat is satisfied.
  6. After the furnace gas burners ignite the furnace, the furnace’s heat exchanger heats up for approximately a minute or so then the furnace blower comes on to distribute the heat throughout your home.
  7. The furnace blower motor and gas continue to burn until the thermostat on your wall satisfies the need for heat (reaches the set temperature) then the thermostat breaks the voltage in the W (white) wire and cuts the gas burners off.
  8. The furnace blower motor continues to run for a set amount of time that is determined by the furnace’s control board until the heat is removed from the furnace’s heat exchanger. Then the blower motor goes off until the next heating cycle from the thermostat on the wall is needed.  If you have any questions please contact us anytime. Our email address is: support@arnoldservice.com
  9. We Would Love to Help You Out and Earn Your Business! Steve & Barbara Arnold

You can search our site for specific troubleshooting, questions with answers, HVAC Parts and supplies in the Google Seach box below.

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Top 10 Thermostat Related Problems with Heating and Air Conditioning

This excellent Youtube Video made by AC Service Tech LLC that explains what are the top 10 thermostat related problems. Thanks so very much to Craig Migliaccio for taking the time to make this excellent video! The 10 problems that are discussed in this video are:

  1. Thermostat Location.
  2. Loose thermostat wire connections.
  3. No C (common) wire and the battery power is low.
  4. Mercury thermostat problems.
  5. Thermostat wired incorrectly.
  6. Thermostat wires intermittently touching each other or grounding out.
  7. Thermostat wires are nicked or broken apart.
  8. Thermostat program settings are incorrect.
  9. Having a hole in the wall, attic or crawl space that is throwing the thermostat temperature off.
  10. Thermostat, control board or other components could be bad.

You can search our site for specific troubleshooting, questions with answers, HVAC Parts and supplies in the Google Seach box below.

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10 Reasons Why a Gas Pilot Light Goes Out or Won’t Stay Lit!

Troubleshooting Gas & Electric Furnaces

Problem: The pilot light on my furnace, water heater or gas appliance will not stay lit! What could be the problem? How do I fix this problem? How do gas pilot lights work and operate?

Answer: Below we have an awesome Youtube video made by AC Service Tech LLC that explains how the gas pilot light functions and 10 reasons why the pilot goes out or will not stay lit. Please click here to see the written page about 10 Reasons Why the Pilot Light Goes Out or Will Not Stay Lit. Thanks so very much to  AC Service Tech and Craig Migliaccio for making this great informational video!

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Make Sure You Test Your Furnace or Heat Pump Early to Make Sure It Is Working Properly.

Troubleshooting Gas & Electric Furnaces

Hi Everyone! We would highly recommend that you test your furnace or heat pump on a cool fall evening to make sure that your furnace or heat pump is working properly. We do not recommend waiting until the weather gets really cold out before testing your heating and air conditioning equipment because this could result in a really cold house or an expensive repair service call. We recommend having an extra furnace hot surface ignitor and flame sensor on hand. We sell furnace hot surface ignitors on the following page: Please click here to see the name brand furnace hot surface ignitors we sell. Please click here to see the name brand furnace flame sensors that we sell.

You might even want to keep an extra furnace pressure switch too. Please click here if you are interested in the furnace pressure switches that we sell.

If you would like to look up any parts for your furnace or heat pump please send us your furnace or heat pump’s brand name and model number and we will be happy to look up and recommend parts for you! Our email address is support@arnoldservice.com

Below we have two real good Youtube videos. One is from Word of Advice TV titled “Is Your Furnace Not Working Right? How to Check it Yourself.”

Another great YouTube Video called, “Furnace Troubleshooting” by Structure Tech Home Inspections.

We have lots of furnace troubleshooting advice on the following page: Please click here to see our Gas & Electric Furnace Troubleshooting page.  I would suggest going through the troubleshooting flow chart to see what is wrong: Please click here if you would like to see a furnace troubleshooting flow chart.  We also have lots of troubleshooting questions and answers on the following page:  Please click here if you would like to see our furnace troubleshooting questions and answers index page.  If you have any specific questions please let me, Steve Arnold  know and I will be glad to try and answer any questions. My email address is support@arnoldservice.com

We hope this will help you keep your home warm and toasty this winter! Thanks so very much for reading this article! God bless you and your family today and always! Steve & Barbara Arnold

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How to Wire Up a Heat Pump Thermostat?

We have many people ask us how do I wire up my new heat pump thermostat? How do I troubleshoot my heat pump thermostat? What do the wire colors mean? What are the functions of the wire and colors? What do the terminals on the thermostat mean? How do I wire up the auxiliary and emergency heat? Below we have an excellent Youtube video Made by AC Service Tech that answers all these questions. If you have any questions please email us anytime. Our email address is support@arnoldservice.com

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How Do I Use and Read a Refrigerant Gauge Set? How do I Check the AC Refrigerant Level?

troubleshooting air conditioners and heat pumps

Question: We have many people ask us the questions: How do I use and read a refrigerant gauge set? How do I check the AC refrigerant level? What do all those numbers and different colors mean? How do I check to make sure I have the right amount of refrigerant in my air conditioner or heat pump system?

Answer: We have three really good Youtube Videos made by Word of Advice TV and AC Service Tech LLC that shows how to read a refrigerant gauge set and how to charge air conditioning systems that use both R410A and R22 refrigerants.  I hope this helps you understand how to read a gauge set. I hope these videos help you get your air conditioner or heat pump charged correctly. If you have any questions please email us anytime. Our email address is support@arnoldservice.com.


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Top 12 Problems and Mistakes when installing or replacing thermostats!

We have been getting lots of questions about how to install thermostats properly. Many questions are about why my newly installed thermostat is not working properly.  I found this excellent Youtube video from AC Service Tech that shows what the top 12 problems and mistakes are when installing or replacing thermostats.  I hope this helps you when installing or replacing a thermostat. Thanks so much to AC Service Tech for making this excellent video! We would love to help you out and earn your business!  Please email us anytime if you have questions. Support@arnoldservice.com

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Problem: AC Unit Not Turning On-How to Fix it.

troubleshooting air conditioners and heat pumps

Problem: My air conditioner will not turn on. What could be the problem with my AC not turning on?

Answer: I found this excellent YouTube video from Word of Advice TV that explains many problems that can cause your Air Conditioner to not work or come on. This is one of the best videos I have ever seen on troubleshooting an air conditioner. I hope this helps you find and fix your air conditioner or heat pump system. If you have any questions please respond in the comments below or email me Steve Arnold at: Support@arnoldservice.com. Thanks so much for giving us the opportunity to serve you! Hope you have a blessed day! Steve

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Top 10 Air Conditioner Service Call Problems

troubleshooting air conditioners and heat pumps

Many people have trouble troubleshooting and finding out what is wrong with their air conditioner when it does not work. I found this excellent Youtube video from Word of Advice TV that shows what are the top 10 air conditioner service call problems. I have the video below. I have the problems listed below the video.  You can see that many of these problems can be easily fixed and are easy inexpensive problems.  I counted 17 top problems and 9 honorable mention problems. I hope this helps you find and fix your air conditioner’s problem. We would love to help you out and earn your business. Please email us anytime if you have questions. Support@arnoldservice.com

  1. Bad Capacitor. Please click here to see the capacitors we sell.
  2. Refrigerant Leaks
  3. Plugged or stopped up condensate drain line. If you have a condensate pump make sure the pump is working and the condensate pump safety switch is not open.
  4. Bad control board on furnace or heat pump.
  5. Bad condenser fan motor. Please click here to see the condenser fan motors we sell.
  6. Bad blower motor or bad blower motor capacitor. Please click here to see the blower motors we sell.
  7. Compressor shorted to ground. (will need a new compressor).
  8. Dirty furnace filter
  9. Tripped AC Breaker (If your AC is not coming on I would suggest turning the breaker completely off and back on again to make sure the breaker is on. Do not touch anything metal on your circuit breaker box for safety).
  10. AC completely out of refrigerant (Freon).
  11. Dirty Condenser Coil
  12. Bad Contactor. We sell contactors on the following page: Please click here to see the contactors we sell.
  13. Drain pan coil leaking water.
  14. Mouse or insect damage in the control box.
  15. Broken or loose wires.
  16. Locked Rotor on compressor. Might use an SPP6 to unlock compressor. Please click here to see the SPP6 compressor hard start booster we sell.
  17. Inefficient Compressor where the valves are blown on the compressor.

Honorable Mention Problems:

  1. Furnace switch turned off on the side of the furnace.
  2. Blown AC disconnect fuses.
  3. Evaporator Coil completely clogged with lint and dirt.
  4. Restricted metering device. Either restrictor pin orifice or TXV stopped up or not working properly.
  5. Cracked condenser fan blade.
  6. Thermostat bad or thermostat batteries bad.
  7. Low voltage transformer bad. Please click here if you are interested in the low voltage transformers we sell.
  8. Door safety switch on furnace not pushed all the way in. Furnace blower door is loose.
  9. Vandalism where someone intentionally did something to cause the AC unit not to work.