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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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Problem: Why does my gas furnace short cycle so much?

Troubleshooting Gas & Electric Furnaces

Problem: Why does my gas furnace short cycle so much? The furnace gas lights, but before the thermostat is satisfied the gas goes off. I do not understand what could be causing the gas to go off in our furnace before our thermostat has been satisfied. I noticed this happening for the past week. What could be the problem?

Answer: We have this question asked quite often. We have an excellent Youtube Video made by AC Service Tech LLC that explains why gas furnaces short cycle below. Craig Migliacco does an excellent and thorough job explaining four reasons why gas furnaces short cycle! Thanks to AC Service Tech LLC and Craig Migliacco for making this excellent video!! Please click here if you would like to see the AC Service Tech LLC written post with pictures that explains The four top reasons why a gas furnace short cycles. In short detail the 4 reasons are:

  • The thermal limit switch is tripping and opening up the electrical circuit. The thermal limit switch tripping could be caused by a dirty filter, dirty blower wheel, dirty or stopped up evaporator coil, a slow blower motor (might need a new capacitor or the gas input might be set too high (might need to adjust gas pressure).
  • The pressure switch is tripping and opening up the electrical circuit. This could be caused by a stopped up vent or a slow, stopped up draft inducer. You might need to clean the furnace’s condensate drain line. Please click here if you would like to see our furnace pressure switch troubleshooting page.
  • The control board could have a relay with pitted contacts that are failing.  You might need a new control board.
  • The flame proving process might be off because of a dirty flame sensor, gas burners or heat exchanger. Please click here if you would like to see our flame sensor troubleshooting page.

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

This excellent video below explains these 4 problems in detail.

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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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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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A Great Super Fantastic Book for Learning How to Service and Repair Air Conditioners and Heat Pumps

My friend, Craig Migliaccio just finished this great book on Refrigerant Charging and Service Procedures for Air Conditioning. If you would like to see more information on the book or purchase here is the link https://www.acservicetech.com/the-book Mr. Migliaccio has dedicated many hours to this excellent book and has been kind enough to make hundreds of Youtube repair and troubleshooting videos. We feature many of these videos taken from the AC Service Tech Youtube Channel on our site! “This book is dedicated to those who are eager to learn the HVACR Trade and Refrigerant Charging/Troubleshooting Practices. In this book, you will find step by step procedures for preparing an air conditioning and heat pump system for refrigerant, reading the manifold gauge set, measuring the refrigerant charge level, and troubleshooting problems with the system’s refrigerant flow. This book differs from others as it gives key insights into each procedure along with tool use from a technician’s perspective, in language that the technician can understand. The book also explains the refrigeration cycle of air conditioners and heat pumps, refrigerant properties, heat transfer, the components included in the system, the roles of each component, airflow requirements, and common problems.”

Procedures Included are:

  • Pump Down
  • Vacuum and Standing Vacuum Test
  • Recovery and Recovery Bottle use
  • Refrigerant Manifold Gauge Set and Hose Connection and Disconnection
  • Service Valve Positions and Port Access
  • Preparation of the System for Refrigerant
  • Refrigerant Charging and Recovery on an Active System
  • Troubleshooting the Refrigeration Charge and System Operation.

 

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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