Home AC and Heater Repair Service

4 Common Heater Problems and Repairs

Heater repair common issues to help keep you warm this winter.

Home AC and Heater Repair Service
Do You Need a Home AC and Heater Repair Service? Home AC and Heater Repair Service

A well-maintained furnace will last a long time. However, like any appliance, your heater will sometimes need service and repair. It’s important to be aware of the warning signs and address any issues as soon as possible. Correcting minor problems as they happen can save you from more costly repairs later. Here are some of the most common heater repair problems you may encounter.

Insufficient Heat

There are several possible reasons for a lack of heating. Here’s what to look at first.


If your heater is blowing cold air, the problem could be as simple as the thermostat being set to Cool instead of Heat. Make sure you have Heat selected and that the fan is set to Auto.

Heat Registers

If too many heat registers are shut, heat may build up in your furnace. The furnace will shut down if it becomes overheated. It’s best to keep at least 80% of your registers open to ensure proper airflow.

Air Ducts

Leaking air ducts will keep your furnace from heating your home properly. Have a heater repair technician examine your air ducts and repair them if they’re leaking.

Blower is Constantly Running

If your furnace blower continuously runs, check these items first:

  • Make sure the thermostat is not set to the Fan setting. The Fan setting keeps the blower running by design. Set the thermostat to Auto instead.
  • The thermostat may have a faulty fan limit control switch. Reset the control switch or have it replaced.
  • The electronic control board may need repair or replacement.

An HVAC technician can help you identify the problem.

Heater Repair – Short-Cycling

If your furnace turns on but quickly shuts off again, this is known as “short-cycling.” Several issues can cause short-cycling to occur.

Dirty Flame Sensor

Your furnace’s gas valve opens when the furnace turns on. Gas is sent into the combustion chamber, where the pilot light ignites the burners. If no flame is present when the gas valve opens, gas can build up, creating a dangerous condition. The flame sensor only allows the furnace to run if it detects a flame when the furnace’s gas valve opens. Short-cycling is a potential warning sign of a dirty or damaged flame sensor.

Clogged Air Filters

Dirty air filters can restrict airflow, leading your heater to work harder to circulate warm air through your home. Without proper airflow, the furnace may overheat and cause the high limit switch to shut the heater off. Regularly changing your air filters can help prevent short-cycling.

Improper Size

If your heater short-cycles regularly, it’s possible your HVAC system is not the correct size for your home. If your system is too large, it will quickly heat your house and then shut off. Over time, frequent short-cycling can lead to higher energy bills. If you suspect your heater is improperly sized, contact an HVAC contractor for help. An experienced technician can recommend the best furnace size for your needs.

Noisy Operation

Excessive noise when you run your furnace has several potential causes.

  • Scraping sounds may indicate a broken or loose blower wheel.
  • Thumping noises are a sign your furnace’s blower wheel is unbalanced.
  • A rumbling noise can indicate a problem with your furnace’s burner. If you hear a rumbling sound coming from your furnace, turn it off and call a repair technician for help.
  • If you hear a squealing sound, you may have a loose fan belt. Your furnace may also need lubricating.

A noisy furnace should be examined by an HVAC technician as soon as possible. It’s important to address the problem before more costly repairs become necessary.

If you’re in need of heater repair, contact us at SoBellas Home Services today. 

The guys in the yellow booties are here for all your air conditioner repair needs, along with expert swamp cooler conversions.  Look to the pros if you have any questions about converting to refrigerated air conditioning with SoBellas.  Call us with questions like, how much does refrigerated air cost or anything about refrigerated air conversion.

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