Common Reasons Why Furnaces Fail

You can easily tell when your furnace stopped working, but what’s the reason? Here are the common causes of furnace/heating system problems and how one of our Air Care technicians can fix them.

Possible Causes:

No Power

Check for blown fuses or tripped circuit breakers at your electrical sub-panel and on or in your furnace; restore power to the circuit if possible.

Power Switch Off

Turn on the power switch to the furnace (not all furnaces are equipped with a power switch.)

Amperage overload: Wait 30 minutes then press the reset button (located in your furnace). Refer to the owner’s manual for the exact location of the reset button.

The Pilot Light is Out

Relight pilot, call a professional if you are unfamiliar with how to relight the pilot on your heater.

No Gas

Make sure the gas valve to the furnace is fully open. Ensure there is gas to other parts of your home (i.e. stove or oven).

The system is Not Providing Enough Heat

Possible Causes:

Thermostat Set Too Low

Raise the thermostat setting 5° above the current room temperature. If the heating system starts, your thermostat is set too low.

Clogged Filter

When is the last time you inspected your air filter? Check it out, if it is filthy, clean or replaces the air filter.

Blower Clogged

If your fan motor is impacted by debris, have an HVAC professional clean the fan assembly.

Supply Registers Closed or Blocked

Ensure all supply registers are open Often they are blocked on accident by rugs, drapes, or furniture.

System out of Balance 

Have a professional evaluation and balance system.

Blower Belt Loose or Broken

If your belt looks worn or is making a screeching sound have an HVAC professional adjust or replace the belt.

Filthy Burner Assembly

This can be a serious health and fire hazard. If you suspect your burner assembly is dirty, shut off the gas to your furnace, disconnect the unit and call a professional.

Evaporator Coil is Obstructed

This is a tough one to diagnose on your own. It’s is best to have an HVAC professional inspect and clean your evaporative coil yearly to prevent this from happening.


Contact Air Care Heating and Air Conditioning

To get your furnace fixed contact Air Care Heating and Air Conditioning by calling us at (949) 482-2911 or click here to connect with us online.

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