No-heat is the call that defines a SoCal winter: the furnace ran fine in March, sat idle all summer, and now refuses to fire on the first cold night in November. The good news is that the failures are predictable and most are inexpensive single-visit fixes. This page is the Carrier-specific companion to our general furnace repair service and our Carrier furnace repair page. Common failure modes have dedicated guides: ignitor replacement, flame sensor, won’t ignite, limit switch, pressure switch, inducer motor, and gas valve.
Why a Carrier furnace stops heating
From thousands of Carrier no-heat calls across SoCal, the causes cluster in a predictable order:
- Hot-surface ignitor wear — the most common no-heat fault. The silicon-nitride ignitor degrades over hundreds of cycles and eventually cracks or no longer reaches ignition temperature. Symptom: blower and inducer run, no flame. $245–$485 installed.
- Flame-sensor fouling — the furnace lights, then shuts down after 3–7 seconds because a dust-coated sensor cannot prove flame to the board. Clean or replace, $185–$295.
- Draft / pressure-switch fault — the inducer cannot prove safe venting, so ignition never starts. Often a clogged condensate trap or a weak inducer. Full detail on our Carrier pressure switch & code 31 page.
- IFC control-board failure — frequently after a Santa Ana voltage transient. $480–$950.
- Gas-valve failure — less common, $385–$685.
- Blower motor failure on the air-handling side, $480–$890.
Read the status code — conventional vs. Infinity
Carrier furnaces report faults two different ways, and knowing which you have saves a wrong turn. On a conventional furnace (59TP6, 58STA, Bryant 313AAV) the amber status LED behind the burner door blinks a code you count. On a communicating Infinity system (59MN7) there is no LED to count — the fault appears as a number in the wall control’s Last 10 System Events screen. Either way the code narrows the fault to a subsystem — ignition, airflow and limit, or pressure and venting — but it is a starting point, not a diagnosis. The full code reference is on our Carrier furnace error codes page. Whatever you do, do not keep resetting a furnace that locks out repeatedly; a lockout is a safety response, not a glitch.
The first-cold-night pattern
An LA-basin furnace runs 200–400 hours a year against 1,500-plus in a cold climate, and that long idle stretch from April to October is where no-heat breeds. Dust settles on the flame sensor, the ignitor ages without being exercised, inducer bearings stiffen, and control-board capacitors drift. The first November cold snap asks an untouched furnace to fire cleanly, and the predictable failures surface all at once. Mountain installs in Big Bear and Wrightwood run real heating hours and fail on a different curve — more wear, fewer idle-related faults. Either way, fall maintenance in October is the cheapest insurance; the cold-air and ignition chains are walked through in our furnace blowing cold air and furnace ignitor failure guides, and older standing-pilot units are covered in pilot light won’t stay lit.
Carrier no-heat repair pricing
Flat-rate, parts and labor, from our SoCal service tickets. Diagnostic is $89 ($149 after-hours), credited to the repair if you proceed:
| Carrier furnace repair | Typical cost |
|---|---|
| Diagnostic (waived with repair) | $89 / $149 after-hours |
| Hot-surface ignitor | $245–$485 |
| Flame sensor (clean or replace) | $185–$295 |
| Gas valve | $385–$685 |
| Blower motor | $480–$890 |
| IFC control board | $480–$950 |
| Draft inducer motor (59TP / 59MN) | $580–$1,100 |
| Heat exchanger (crack — we quote replacement) | $1,500–$3,500 |
Warranty-covered parts on a registered Carrier furnace still carry labor ($200–$450 typical); we look up your registration before ordering. These are the same flat rates on our Carrier furnace repair page.
Repair or replace your Carrier furnace
Under 10 years old with a repair under roughly a third of replacement cost, repair it — a 59TP6 with a failed ignitor or inducer at year 9 has plenty of cabinet and heat exchanger life left. Over 15 years, or any age with a cracked heat exchanger, replace it: a cracked exchanger is a carbon-monoxide path, and we red-tag and shut the gas before leaving. The 10-to-15-year window is judgment, and we give you the repair figure and a written replacement quote side by side. See furnace installation when replacement is the call.
Carrier and Bryant
Bryant and Carrier are the same corporation and largely the same equipment. The Bryant Legacy 313AAV is the Carrier 58STA under different badging; boards, gas valves, ignitors, and inducers cross-reference, and the no-heat diagnosis is identical. We service Bryant furnaces with the same parts channels and warranty lookups. For the cooling side of a Carrier system, see Carrier AC repair, and the full lineup on our Carrier brand page.