Dealing with Common Furnace Issues? Use these Tips

Dealing with Common Furnace Issues? Use these TipsNow that you’re using your furnace on a regular basis, there’s a small chance that you may run into a few trouble spots during its operation. Fortunately, it’s easy to troubleshoot many of these issues on your own. The following highlights a few of these common furnace issues and how you can successfully troubleshoot and even repair them.

  • If it produces no heat – Make sure the thermostat is actually set to “heat.” If that doesn’t work, try moving the thermostat setting up or down a few degrees. Don’t forget to check the circuit breaker and the pilot, as well as the control valve for the furnace’s fuel supply.
  • If it doesn’t produce enough heat – Check the air filter and if it’s clogged, replace it with a fresh one. If that doesn’t work, have your HVAC technician check and readjust the burners.
  • If it turns on and off too frequently – Check and adjust the thermostat heat anticipator, if necessary. You might also want to check the blower motor for proper lubrication and belt tension.
  • If the blower fan does not turn off – Make sure the fan isn’t set to run continuously. If the thermostat has no fan setting, check for a faulty fan limit control switch.
  • If the pilot light goes out – There are many causes that could result in a blown-out pilot light. Check the immediate area for strong drafts. Also, check the gas tube for signs of dirt and debris. You’ll also want to make sure the thermocouple is working properly.

For more great furnace troubleshooting tips, contact us at Sherlock Heating & Air Conditioning. We proudly offer top-notch heating and cooling services for homeowners throughout Carlsbad, La Costa and Encinitas.

Our goal is to help educate our customers in the greater San Diego and San Marcos, California area about energy and home comfort issues (specific to HVAC systems). 

Credit/Copyright Attribution: “PathDoc/Shutterstock”

Related Posts


  • Recently our heater blows out cold air. It will blow it at full capacity, but it will not heat up. I am glad that I found your tip about checking the furnace’s fuel supply. I will have to try that.

  • Thank you for the tips. I had furnace and air conditioning service and inspection done at the end of the summer, but I want to be prepared if I have any issues. Before the service was done, it had been far too long since I changed out the furnace air filter. How often does that need to be changed out?

  • It’s interesting to read that the problems I am dealing with are actually fairly common. My furnace hasn’t been heating as much as I’d like lately, and it is getting rather frustrating. I think that checking the filters to make sure they’re not clogged is a great idea, and I’ll definitely have to contact an HVAC technician if that’s not the case.

  • This is some great information, and I appreciate your suggestion to have a technician adjust the burners of your heater if it’s not producing enough heat. I noticed that the furnace wasn’t working very well, so I replaced the filter, but it’s still having some issues. I’ll definitely look into having a technician come and adjust the burners if needed. Thanks for the great post!


Write a comment