Signature HVAC Blog: Posts Tagged ‘Malvern’

Why Is My Furnace Having Trouble Coming On?

Monday, February 15th, 2021
natural-gas-jets

This is not the kind of question you want to ask during winter. You have your thermostat set for a warm temperature, and the house is definitely cold enough—but your furnace is struggling to turn on, and maybe not getting there. Maybe you hear clicking from the furnace cabinet, and the burners turn on for a short while, but it doesn’t last. If you feel like turning on the furnace is as much a struggle as getting a car engine to turn over on a freezing day, then you may have an issue that requires professional furnace repair in Malvern, PA.

We’ll look closer at what may be happening with your furnace that is creating this frustration.

Always check the furnace filter first

This is a good rule of thumb for any time you’ve got an issue with a furnace not working the way it should or running up heating bills. See if the furnace filter is clogged up and needs to be replaced. A clogged filter cuts off the airflow into the furnace, and without airflow, the furnace will struggle to get the burners lit or any heat moving. The furnace filter should have changes every one to three months, and if you aren’t doing it regularly you can expect furnace problems like this to occur.

The ignition system or pilot light is in trouble

Few furnaces today use standing pilot lights to ignite the burners. If you have an old furnace it may have a pilot light; check to see if it is burning steadily. If you have to relight it and it goes out again soon after, it’s time to call for pros to look into it.

Most furnaces use a type of electronic ignition system to light the burners. Your igniter may not be heating up enough or creating strong enough sparks to get the burners going. HVAC technicians can replace the igniter to fix this.

Obstructed burners

A common source of a furnace that won’t easily start up is because the burners have dirt, grime, or carbon particles on them that’s blocking the gas jets and making it harder for them to get the oxygen they need to ignite. You can’t clean off the burners as a DIY job: professionals must remove the burner assembly and chemically clean it. 

Gas flow issues

If you hear a constant clicking sound from the furnace as it tries to start, it may indicate a problem with a stuck gas valve that’s inhibiting the flow of natural gas to the burners. Another possibility is faulty gas lines or even gas leaks. These are potentially hazardous problems, so we recommend shutting off the gas to the furnace and calling for assistance.

Electrical issues

The problem could stem from faults in the control board of the furnace. Gas furnaces rely on these electrical components as much as electric furnaces! Bad relays or broken connections can cause the furnace’s start-up cycle to fail. 

If you believe you need help to get your furnace back to working shape, rely on us: we offer service in hours, not days!

Signature HVAC offers the Signature Service You Can Trust! Schedule service for your heating repairs or other heating needs with us.

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