Furnace repair when the heating quits
No heat, short cycling, or a system that will not stay lit. Diagnosed by an HVAC technician — including the safety checks that matter.
- Typically $150–$700 typical repair
- 1–3 hours
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What furnace repair usually costs
$150–$700 typical repair
Ignitors and flame sensors are common and affordable; blower motors and boards cost more. A cracked heat exchanger usually means replacing the furnace.
A typical US range to plan around, not a quote — every professional on Task Masters sets and publishes their own price, and you see it before you book.
What a furnace repair job normally includes
- Diagnosis across ignition, airflow, gas and control faults
- Ignitor, flame sensor, limit switch and blower motor replacement
- Burner cleaning and filter replacement
- Heat exchanger and combustion safety inspection
- Full cycle test and thermostat check before leaving
About furnace repair
A furnace that will not run is usually an ignitor, a flame sensor, a limit switch or a blower motor, and all of those are ordinary repairs. What separates furnace work from most trades is that some faults are safety faults: a cracked heat exchanger can put combustion gases into the house, which is why a technician checks for it rather than only fixing the symptom you called about.
Furnace repair typically runs $150 to $700 depending on the part. Flame sensors and ignitors sit at the low end and are among the most common failures; blower motors and control boards are at the top. Heat exchanger replacement is the expensive exception at $1,500 to $3,500, and on an older furnace that is usually the point at which replacing the unit is the better decision. A furnace that short cycles or will not stay lit is frequently a dirty flame sensor or a restricted filter — worth checking the filter before you book.
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Questions about furnace repair
The furnace starts then shuts off after a minute. Why?
That is short cycling, and the usual causes are a dirty flame sensor, a restricted air filter, or a limit switch tripping on overheating. All three are inexpensive repairs, but the system is shutting itself down for a reason and should not simply be reset repeatedly.
What is a cracked heat exchanger and why does it matter?
It is a crack in the metal separating combustion gases from the air circulated through the house, and it can let carbon monoxide into your living space. Technicians check for it as a matter of course. It is not repairable in practice — a cracked exchanger means replacing the furnace.
Should I get the furnace serviced annually?
Yes, ideally before the heating season. An annual service catches the cheap failures before they become no-heat call-outs in January, keeps efficiency up, and includes the combustion safety checks. It is also a condition of many manufacturer warranties.
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