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Furnace Troubleshooting – Common Problems and How to Fix

Troubleshooting furnace problems might seem like a bit of a task. However, there are many ways of troubleshooting gas furnace problems. These include calling tech support, reading the manual, and calling a technician.

Most common furnace problems

  • Lack of maintenance
  • Dirty filters
  • Wear and tear
  • Electric Ignition or pilot control problems
  • Malfunctioning thermostat
  • The furnace doesn’t heat at all
  • The furnace doesn’t heat enough
  • Frequent cycling
  • The blower continuously runs
  • The furnace is too noisy

Another example of furnace problem:

My furnace has been acting weird lately and I am having problems troubleshooting it. It has two problems: It doesn’t sound like it’s igniting lack of that torch sound, and the blower sounds like it is overworking; rotating a lot faster than usual. However, if I reset it enough by taking on and off the panel to the control board it will eventually work right.

I’ve been having problems with one of my furnaces for 2 years, and have had many service calls. I have a dual furnace system, the one has been problematic. When it gets cold, the furnace will lock out, and I’ll have to press the reset button.

How to Fix Furnace Problems

Troubleshooting furnace might seem easy for you, especially if you have experience working with other makes and models of furnaces. If you feel comfortable working on your furnace yourself, there are two primary ways you can learn how to fix your furnace. These include calling tech support and reading the manual.

If you just purchased your heater, then you should have a warranty on it. Technical support should be provided to you at no cost. When you call tech support for home furnace troubleshooting, they will walk you through steps to take on figuring out what is wrong.

If you need to replace a part and would like some assistance, the tech support will also walk you through on how to install the part and repair the unit. Some technical support teams for a manufacturer will charge you per question if your warranty has expired. Keep this in mind before you pick up the phone and call about gas furnace problem that turns on and off by itself.

All gas furnaces come with a manual. The manual will include information about the names of every part, the functionality of every part, and a section for how to maintained and how to repair. It is always best to look through the manual before you pick up the phone and call tech support or someone out to your home to fix it. Because for some case, the problems could be simple.

If the problem is simple, you will most likely be able to fix the issue yourself. If you have lost your manual, you can look online for a digital copy and chances are good it will be available for download. Also, if you don’t find the answer you are looking for, research online and see if other people have had the same problems with the same type of furnace.

The internet is common and most likely someone will have been through the same issue and be able to tell you what you need to do in order to fix it.

Another technique for troubleshooting gas furnace is by calling an HVAC technician. Some warranties will be voided if you try to repair a unit yourself. Find out if your warranty allows you to repair the unit or if you are required to call a technician.

If you have a warranty on your furnace, it will most likely pay for the cost of the HVAC technician or your fee will be relatively low. If you don’t feel comfortable trying to repair the furnace on your own, call a professional. You don’t want to be out of heat for the winter because you made the issues worse than they were and now you really can’t afford to fix the furnace.


There are many ways you can find the answers you are looking for how to fix furnace problems. You can read the manual provided by the manufacturer, call tech support, and call a professional HVAC technician to come and fix it for you. Any furnace may having problems, so it’s always a good idea to call an HVAC technician examine the unit and suggest the best solution.