How to Fix Heater Problems: 5 Common Furnace Issues

Having a common furnace in your home, especially during the cold seasons, provides the warm comfort you need to fight off cold air. It uses air ducts to provide warm air through these tubes to maintain your home’s heat.

Furnaces, however, need constant maintenance to work well. What issues might need fixing? We will look at 5 Common Furnace issues.

1- Furnace Not Powering on

It is frustrating when you switch on your furnace, and it does not turn on. There are various reasons for this problem.

  • The first thing to check is to make sure the circuit breaker is on. If that is the case, turn it onto the “ON” position and try restarting the furnace.
  • Ensure that your thermostat is working, as it should be. Is the setting set on cool? Could the thermostat have reset itself due to a lack of power? Set it at a higher temperature.
  • Maybe your furnace has blocked air filters. Blocked furnace’s air filters from dust restrict the airflow and might cause your furnace not to turn on. If possible, remove the air filters and clean them. Experts advise that disposable air filters need replacement every 60 to 90 days. Regularly clean permanent air filters to avoid the buildup of dust and dirt.
  • Check that the furnace ignitor works, as it should. A faulty ignitor will hinder the furnace from lighting up.

Have you checked all the above and the furnace still will not turn on? Seek professional advice.


2- Water Leaking from the Furnace

Furnace water leak results from a condensation leak caused by a clogged tubing or heat exchanger. If you have a humidifier attached to your furnace, check to see that it is not the cause of the furnace water leak. You might have to make some water heater repairs. Furnace water leaks, if left unattended, lead to further damage and costly repairs.

  • Turn off the power and dry out the water with a mop or towel.
  • Clean clogged air filters.
  • Seek advice from your HVAC repair professionals.

3- The furnace Produces brief bursts of heat.

Furnace short cycling is when your furnace switches on and off continuously for brief spurts of heat that do not warm up your home. To protect itself, the furnace powers down to protect from damaging its motors.

  • Flame sensors weaken: Have a HVAC professional check your sensors and replace them if necessary.
  • Clean or replace the air filters to allow free flow of air to heat your home
  • Check that your furnace is not overheating due to a lack of enough airflow or a broken thermostat.
  • Seek advice from your HVAC repair professionals.

4- Furnace Producing Sounds

When your furnace produces grinding, scraping metal and rattling sounds, it is time to have your furnace checked. The cause of these sounds might be due to worn-out furnace belts, loose screws, or worn-out pieces. Have a professional check out the sounds and replace or repair the needed parts.

5- Furnace Fan is Running without Stopping

The fan cools the furnace down to avoid overheating. The fan should start and stop depending on the heating and cooling process. A continuously working fan might show that you have a damaged thermostat or a short circuit.

  • Change the settings of your thermostat to “AUTO.”
  • Lower the temperature of the thermostat
  • Ensure that the limit switch is on “AUTO.”
  • If the issue continues, consult a HVAC professional.


To prevent your furnace from constant breakdown, plan and do regular checks and regularly clean the air filters to maintain the furnace performance. Clogged air filters trigger various heater problems. Always seek professional guidance to maintain and fix your heating furnace.

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