By Bens Air Conditioning | Serving all of Maryland
If your furnace fires up, runs for a couple of minutes and shuts off, then repeats, it's short cycling. Left alone, short cycling wears out parts, raises gas bills and eventually leaves you with no heat on the coldest night of the year.
Restricted airflow makes the heat exchanger overheat, and the high-limit switch shuts the burners off to protect it. Replace the filter first.
A flame sensor coated in residue can't confirm the burners lit, so the control board shuts the gas off within seconds. Cleaning it is a quick furnace repair.
Modern furnaces check for proper venting before igniting. A blocked exhaust, a failing inducer motor or a stuck pressure switch causes rapid cycling and error codes.
A thermostat near a heat register, in direct sun or with loose wiring can call for heat and cancel it repeatedly.
A furnace that's too big for the house satisfies the thermostat in minutes and shuts down. This is common in additions and renovations. A proper heating installation with correct sizing solves it.
Overheating and short cycling can be symptoms of a cracked heat exchanger, which is a carbon monoxide safety risk. An annual furnace tune-up includes a heat exchanger inspection.
Short cycling never fixes itself. Call (855) 459-5498 for same-day no-heat and furnace repair anywhere in Maryland.
24/7 emergency air conditioning and heating repair anywhere in Maryland. No overtime fees.
☎ Call (855) 459-5498