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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Furnace Repair in St. Louis Park, MN
St. Louis Park furnace repair starts with a $79 trip charge, waived once you approve the work, in postwar homes on CenterPoint gas. Many postwar story-and-a-halfs here share a chimney with the water heater, so draft is an early check.
Furnace repair calls in St. Louis Park homes
St. Louis Park's postwar houses put the furnace in a low basement, often beside a gas water heater that shares the same masonry chimney. That setup matters on a repair call. An 80% furnace venting into a chimney partly blocked by fallen mortar or a failed liner can keep its pressure switch from closing, or trip a rollout switch, and the burners shut down. A draft and carbon monoxide check around the flue belongs on any furnace or water-heater service here. In the story-and-a-halfs, the finished upstairs usually has little or no ductwork, so owners turn the thermostat up and the furnace runs long, hard cycles that finish off inducer bearings and igniters.
Houses already converted to a 96% furnace have a different winter failure: PVC terminations in a narrow side yard, where snow sliding off two roofs drifts in and blocks the intake. The pressure switch opens and the furnace locks out.
Updated November 10, 2026
What do common furnace repairs cost in St. Louis Park?
National averages (HomeGuide, 2026), not our prices: an igniter $100–$250, a flame sensor $80–$250, a pressure switch $150–$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
Furnace repair in St. Louis Park: questions
The upstairs of our St. Louis Park story-and-a-half stays cold even when the furnace runs nonstop. Is the furnace failing?
Probably not. Most of these houses have no real ductwork to the finished upper rooms, just a grille or one small run, so heat reaches them by drifting up the stairs. A furnace running nonstop to satisfy a main-floor thermostat wears out sooner. We check the furnace first, then talk through options for the upstairs, such as a ductless head, so the furnace stops chasing a load it can't reach.
Can a furnace and water heater sharing a chimney cause carbon monoxide problems in an older St. Louis Park house?
They can if the chimney doesn't draft well. A cracked or blocked flue, a missing liner, or a house depressurized by a strong kitchen or bath fan can push exhaust back into the basement. We can check draft and measure CO near both appliances. Minnesota law requires working CO alarms within 10 feet of every sleeping room, and in a story-and-a-half that includes the upstairs bedrooms.
More in St. Louis Park
- Furnace replacement in St. Louis Park
- AC repair in St. Louis Park
- AC replacement in St. Louis Park
- Heat pumps in St. Louis Park
- Mini-splits in St. Louis Park
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- Tune-ups in St. Louis Park
- All HVAC service in St. Louis Park
Furnace repair near St. Louis Park
- Hopkins, MN furnace repair · 4 mi
- Golden Valley, MN furnace repair · 4 mi
- Edina, MN furnace repair · 4 mi
- Minneapolis, MN furnace repair · 5 mi
- Richfield, MN furnace repair · 6 mi
- Robbinsdale, MN furnace repair · 6 mi
Brands we repair
Guides on furnace repair
What Does the Blinking Light on My Furnace Mean?
A blinking furnace light is a control board fault code. How to read it safely, what common codes mean, and when to call 612-429-3465 instead of resetting.
Read the guideWhy Is My Furnace Leaking Water? Causes by Where It Drips
Water under your furnace, even in summer? Find the source by where it drips: drain, pump, humidifier or AC coil, and what our $79 trip charge covers.
Read the guideContact Us
Heat out? AC quit? Call or send a request.