Top 5 Gas Furnace Troubleshooting Tips

If your home has a gas furnace, likely there will be some problems at one point of another. Instead of having to call a professional HVAC specialist to inspect and repair your furnace every time, it is handy to be able to make minor adjustments and fix small problems on your own. This can save you both time and money. Here are the top 5 gas furnace-troubleshooting tips.

  1. In some cases, you gas furnace may stop producing heat. When a furnace doesn’t emit heat, there could be several problems at hand. One problem could be that the thermostat is set too low; if this is the case, make sure your thermostat is set to heat mode and that it is turned up to your desired temperature. If this doesn’t help the problem you could have a broken thermostat. To check, move the dial setting up or down a few degrees to see if there is a difference.
  2. If the furnace is still producing heat, just not enough, you may have a problem with the filter or airflow of your furnace. Clean a dirty filter by replacing it altogether with a fresh, new one. If this doesn’t do the trick, you may need to call a service tech to come in and adjust the burners of the furnace. The lack of heat could also be due to obstructed air flow going into the combustion air chamber, so you will need to make sure you can get an adequate amount of combustion air in your system.
  3. Another problem many people experience with their furnace is that the furnace turns on and off to frequently during the day or night. This could also be due to a dirty furnace cleaner and this problem requires a replacement filter. However, the issue could also be due to a blower motor problem or a thermostat problem. Try to fix the blower by adding a oil to motor lubrication ports. Also check that the belt has proper tension and tighten it as needed. If the belt is frayed at all, you will need to have it replaced as soon as possible.
  4. If your blower is constantly running and never turns off, see if the fan is set to fan continuous on the settings. If it is, changing this setting can possibly stop the fan. Another cause could be a faulty fan limit control switch on the furnace, which would mean that the fan has no setting. In this case, you should reset or replace the furnace fan limit control switch so it can operate normally.
  5. Finally, if the gas pilot is out, you will need to light it again. Pilots have been known to go out as a result of strong drafts, dirt on the surface, or dirt in the gas tube of the furnace. Look up the specific steps for this re-lightning process, since they differ slightly from model to model.

All of these troubleshooting tips will help you to attempt to identify the problem you are experiencing with your gas furnace. Whether it isn’t producing enough heat, the blower constantly turns on and off, or the gas pilot is out, walking through these tips can allow you to try to solve the problem on your own, consider upgrading your furnace, or know when to call for help to get the problem fixed in the best way possible.

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