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Furnace troubleshooting questions with answers index


Below we have quick links to pages where problems and solutions are discussed for your quick reference and hopefully a quick solution to your problem. Special thanks are in order for the many people who took the time to make the YouTube videos that are included on our pages! I know that it is much easier for me to learn if I can see the problem and repair through a video or picture! Near the bottom of each page there is an area that allows you to comment or ask questions. If you have any questions please send us an email anytime: or comment on the perspective page. We would love to help you out, answer your questions and earn your business! Hope you have a blessed day! Steve & Barbara Arnold

One of my favorite quotes by David Jeremiah: “Nothing is more valuable than helping another person succeed!”

  1. Problem: Furnace blink code shows I have a pressure switch problem. Replaced pressure switch. Still have a problem?
  2. Problem: Will the pressure switch correct my water drainage problem? (With two YouTube Videos)
  3. Problem: Why does my furnace rollout switch have to be reset so often? Why do rollouts have different temperature differences? (With two YouTube Videos)
  4. Problem: Why does my furnace air conditioner have poor air flow? (With one YouTube Video)
  5. Problem: How do I test and troubleshoot my gas furnace pressure switch? (With one YouTube Video)
  6. Problem: What is the sequence of operation of my 80% gas furnace? (With one YouTube Video)
  7. Problem: Furnace will not ignite. Ignitor will not glow. (With two YouTube Videos)
  8. Problem: Furnace or water heater pilot will not stay lit. (With one YouTube Video)
  9. Gas & Electric Furnace Troubleshooting Simplified (With one YouTube Video)
  10. Furnace Troubleshooting Flow Chart.
  11. Problem: Furnace comes on, doesn’t run long then shuts off. Will work if thermostat is turned way up. (With one YouTube Video)
  12. Furnace Hot Surface Ignitor Troubleshooting Videos.
  13. Problem: How do I wire up my new thermostat? What do the wire colors mean? (With two YouTube Videos)
  14. Thermostat Replacement (Video)
  15. Furnace Control Board (Video)
  16. Furnace Blower Replacement (Video)
  17. Problem: Burners ignite the gas valve cuts off after only a second because the pressure switch is opening for a split second.
  18. Problem: Furnace main burner ignites, the main burner stays on for 8 to 10 seconds, then shuts right back off (With one YouTube Video)
  19. Problem: I purchased a flame sensor from you for my Goodman furnace. The new flame sensor did not fix the problem? (With two YouTube Videos)
  20. Problem: Blower shuts off too soon, cycles off and comes back on within 30 seconds
  21. Problem: The fan on your furnace runs all the time and will not shut off (With one YouTube Video)
  22. Problem: Fan will not come on in the “ON” position or your fan will not come on when you turn the thermostat down
  23. Problem: Furnace, air conditioner heat pump will not come on. Blown fuse on board. (With one YouTube Video)
  24. Problem: Draft inducer will not start, ignitor will not glow or gas valve will not open.
  25. Problem: Electric heat will not come on, fan will not come on.
  26. Problem: Why do I have to replace my furnace ignitor every two weeks?
  27. Problem: My Trane IGN00145 Ignitor is going out too often? What could be the problem?
  28. Problem: I have a bad igniter is there anyway to light a gas furnace manually?
  29. Problem: Burners ignite the gas valve cuts off after only a second because the pressure switch is opening for a split second.
  30. Problem: No gas.. bad control board? Frazier Johnson heater.
  31. Problem: My furnace is making a howling noise only in the winter time?
  32. Problem: Why is my heating bill so high? Over $500!
  33. Problem: Could a weak thermostat battery destroy my home?
  34. Problem: Furnace blower motor works intermittently?
  35. Problem: The heater comes on, the gas lights, the furnace warms up, the blower starts then abruptly the gas cuts off.

6 thoughts on “Furnace troubleshooting questions with answers index

  1. my daughter made thee part of a plug piece that fits togethr bitsbthe plug piece go down thee vent in her bedroom how do i get it out

    1. Hi Terry! If the plug is not too far down the vent I would suggest using a vet vac with a long hose to try and retrieve the piece out of the vent. Sometimes a small mirror and a flash light might help you in viewing the lost piece. If the piece slipped too far into the vent to use a wet vac then you might have to take the vents (duct work) apart to retrieve the lost plug. I have you can get it with a wet vac. Best of luck! Steve

  2. it s winter, upper mich, my ladyfreind sets her furnace at 60! the temp inside is 59 the furnace kicks in but does not blow heat, shuts down, and repeats another cycle the furnace works fine when its set above the inside temp of the home, what damage will this cause to the furnace , if any ?

    1. Hi Mr. Scheiding! Thanks so much for asking this question. It is not good for the parts inside the furnace to short cycle. Parts have just so many cycles in them. The short cycling can cause premature failure. Wow! 60 is pretty cold! The thermostat might not be programed to go that cold. Of course, you would need to determine what is causing the short cycling. Is this a thermostat problem, a flame sensing problem etc? We have a furnace troubleshooting flow chart that should help you find the problem on the following page: We have lots of furnace questions and answers on the following page: I would suggest starting my testing between W and C (com) on the furnace control board to see if the thermostat is cutting the furnace off and on. Please make sure you are getting a constant 24 to 28 volts AC between the W and C (com) terminals on the control board when the thermostat is calling for heat. If you aren’t then this is a thermostat problem. If it is a thermostat problem then you would need to get a new thermostat or try to set the thermostat degree difference or anticipator up so the themostat keeps the furnace on longer. If this is a flame sensor problem I would suggest trying to clean the flame sensor. I hope you can easily find and fix the problem. I hope you have a blessed day! Steve

  3. I have a Carrier 1986 Model 58GS100-150CA furnace. Lately the main burner ignites and then immediately shuts off then re-ignites several cycles. Finally it will remain on and run normally. I cannot locate a flame sensor on this unit. I do not believe it has one. So what else could cause this problem?

    1. Hi Mike! This could be something as simple as a dirty 3-wire pilot burner. I would suggest that you try to clean the 3- wire pilot burner out with compressed air. Our Carrier parts program shows that your furnace uses the LH680005 three wire pilot burner that we sell on the following page: I hope that cleaning the pilot burner fixes your problem. If not you might need a new pilot burner. I would also recommend that you check are wire connections and grounds to make sure they are good and tight. Steve

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