Carrier Furnace Error Codes: What the Blinking Light Means
Carrier furnace error codes from the maker's own troubleshooting guides: how to count the flashes safely, what each code means, and when to call a tech.
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Newport furnace repair starts with a $79 trip charge, waived when you approve the repair. Old Town cottages often vent into chimneys older than the furnace, so draft gets checked first. The written price comes before any work.
Newport's furnace calls follow its terrain. Down in Old Town near the river, the houses are mostly cottages and bungalows, and the furnace often vents into a chimney older than anything connected to it. Blocked or crumbling flues show up there as pressure switch lockouts, rollout trips and backdrafting at the water heater.
East of Highway 61, the 1960s houses usually have furnaces that are second or third replacements, so the repairs are the familiar ones: igniters, flame sensors, inducer motors and blower capacitors. On the bluffs, larger homes push air through long ducts to far rooms, and a condensing furnace may drain to a pump because the floor drain sits across the basement. When a high-efficiency furnace stops in one of those homes, we check the condensate pump and its overflow switch early, since a full reservoir cuts the furnace off.
Updated November 10, 2026
National averages (HomeGuide, 2026), not our prices: a control board $300–$650, an inducer motor $400–$1,100, a PSC blower motor $500–$1,400. More in the furnace repair cost guide.
Symptom guides: Red tag · Carbon monoxide · Blowing cold air · Won't ignite · Signs your furnace needs a technician
Often, provided it passes a safety check. We measure carbon monoxide at the furnace and in the living space, test the flue's draft and inspect the heat exchanger. If those are sound, a repair that carries you through winter is reasonable, and the replacement can wait for a milder month. A cracked heat exchanger or exhaust spilling into the basement is another matter: that furnace gets shut down until it's repaired or replaced.
Its overflow switch is doing its job. Many condensate pumps have a float that cuts power to the furnace when the pump can't empty, so the basement doesn't flood. The usual culprits are algae or sludge in the reservoir, a worn-out pump motor, a stuck check valve, or a discharge line that's kinked or sloped the wrong way. We clean or replace the pump, correct the line, then run the furnace through a full cycle.
Carrier furnace error codes from the maker's own troubleshooting guides: how to count the flashes safely, what each code means, and when to call a tech.
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Read the guideA furnace that turns on and off too often tells you what's wrong by how long it runs. How to time a cycle, what it means, and when to call 612-429-3465.
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