Tip & How-To about Heating & Cooling

Gas Furnace Repair - Steps to Troubleshoot the Problem Yourself

Normal 0 MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman";} Your gas furnace is not heating. You know that is has power because the lights are blinking showing you some kind of weird code. But it is getting colder by the minute and you wonder if there is anything that you can do. Here are some basic things that the homeowner can check.

The lights blink a crazy combination of on and off sequences. The furnace is trying to talk to you. The problem is that you don’t understand the language. The language of the furnace can be very confusing if you do not know what the problems that the furnace is trying to tell you through the flashing codes is.

Before running to the phone to call the heater guy to decipher the codes there are some thing that you should check. First and most important make sure that the power is on to the furnace. If there are no lights flashing on the circuit board that is a good indication that you probably have a power problem.

Now that you know that there is power, recycle the power on and off. This will often reset the brain of the furnace and wipe out the problem so that it will try to go through the startup cycle again. If the problem was temporary, like low voltage, or low gas pressure the furnace may light up and be fine.

If the furnace stops during the lighting cycle then you may have other issues and will need to look into the problem further with the help of a professional. Of course you need to make sure that your flue is not blocked or that the filter in the furnace is clean. These things are common causes of problems and can easily be fixed.

These are the first basic steps to trouble shooting your furnace problem. To check out the problem further you may need some specialized tools to find out where the problem lies.
Make sure that you at least try these things before calling a professional to save yourself the expense of a service call that is only a couple of minutes long and makes your feel like you are paying the guy to bush a button and run again.

Believe me when I tell you this. There have been many calls that I have had that were just a matter of recycling the power and then leaving the bill. Do not let this happen to you!

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1 Answer

default code gas furnace


Blinking light will be a number of long beeps, followed by short ones.

Count each, then check against codes listed on door to unit.

Good luck.

Oct 03, 2017 | Heating & Cooling

1 Answer

furnace wont keep kicking back on. On its own, led light does blink 3 times stops and blinks 3x again


Without knowing fuel or model, it could be bad relay in primary control or loose wiring, on either power or t-stat side.


*I never recommend homeowner attempt to repair/replace any parts on heating appliance. Any information is strictly to educate homeowner on functionality. Always contact a heating professional for service and annual tune-up.

Feb 13, 2016 | Heating & Cooling

1 Answer

My American Standard Furnace light blinks 3 times stops and blinks 3 times again and so on.


Look inside of service panel for trouble shooting codes and solutions

Feb 13, 2016 | Heating & Cooling

1 Answer

Carrier Gas Furnace runs fine randomly stops blowing LEDs flash


That blinking light may be the diagnostic light. Count the blinks next time it fails. Carrier units will have two different blinks depicting the error code such as one blink followed by a pause than 3 blinks giving you an error code of 13. Then look at the wiring diagram, it will have an error code chart telling you where to start with your diagnosis. You already know that if you remove the cover it erases the error code, so look thru the small window first.

Nov 30, 2009 | Carrier XHB123D X/Y Series Heat/Cool Air...

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