What Does the Blinking Light on My Furnace Mean?
The blinking light on a furnace is a fault code from the control board. How to read it safely, what common codes mean, and when a reset is fine or not.
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Furnace Repair in North St. Paul, MN
Furnace repair in North St. Paul begins with a $79 trip charge, waived when you approve the repair, and a written flat-rate price before any work. We run 7am–9pm, seven days. Houses near downtown go back to the railroad-town years, and their converted heating systems get a full venting and safety check.
Furnace repair calls in North St. Paul homes
The usual North St. Paul furnace call is in a postwar basement: an 80% furnace, often the third one in that corner, with its flue joined to the water heater's in one chimney. The failures follow that setup: a worn inducer, a cracked igniter, a pressure switch that stays open, and draft trouble when the flue is partly blocked. Older houses near downtown add conversion quirks, with ducts and flue connectors adapted from equipment that once burned coal.
The townhomes and condominiums built since 2000 bring a different list. Their high-efficiency furnaces fail at condensate traps, drain lines and inducers, and a PVC pipe iced over at the wall will lock one out on a subzero night. One local wrinkle: if the furnace and the lights quit together, the outage belongs to the city's electric utility, not Xcel Energy, which supplies only the gas here.
Updated September 26, 2026
How much does furnace repair cost in North St. Paul?
Every furnace repair call in North St. Paul starts with a $79 trip charge, waived when you approve the repair, and a written price before any work. Same prices in North St. Paul as in every town we serve. National averages (HomeGuide, 2026), not our prices: a limit switch $100–$375, a control board $300–$650, an inducer motor $400–$1,100. More in the furnace repair cost guide.
Signs your furnace needs a technician
- The inducer starts, the igniter glows, then the burners never light
- The burners light for a few seconds and shut off, over and over
- The furnace runs but the vents blow cool air
- A blinking code on the control board, or the furnace has locked out
- Your CO alarm went off or the burner flames look lazy and yellow
- New banging, squealing or grinding when the furnace starts
- Water pooling around a high-efficiency furnace
More detail on our furnace repair page.
Symptom guides: Blowing cold air · Won't ignite · Short cycling · Blinking light codes · Pressure switch trips · Strange noises · Leaking water · Burning smell · Red tag · Carbon monoxide
Furnace repair in North St. Paul: questions
Our furnace and our lights went out at the same time in North St. Paul. Who do we call first?
Call the city's electric utility first, because North St. Paul's power comes from the city, not Xcel Energy. A gas furnace can't run without electricity for its igniter, inducer and blower. When power returns, the furnace should restart on its own. If it doesn't, or the control board flashes a fault code, call us. Surges when power comes back can damage control boards, and we test the board before replacing it.
The furnace in our older house near downtown North St. Paul keeps tripping its rollout switch. What's going on?
A rollout switch trips when flame spills out of the burner area instead of heading up the flue, and in older houses the cause is usually venting: a chimney partly blocked by fallen mortar or a collapsed liner, a flue connector with poor slope, or a heat exchanger that's cracked or clogged. Don't keep resetting it. It's a carbon monoxide risk, so check your CO alarms and have us inspect the flue and heat exchanger.
More in North St. Paul
- Furnace replacement in North St. Paul
- AC repair in North St. Paul
- AC replacement in North St. Paul
- All HVAC service in North St. Paul
Furnace repair near North St. Paul
- Oakdale, MN 4 mi
- Mahtomedi, MN 4 mi
- Maplewood, MN 4 mi
- Lake Elmo, MN 4 mi
- Little Canada, MN 4 mi
- Vadnais Heights, MN 5 mi
Brands we repair
Guides on furnace repair
Furnace Blowing Cold Air: What to Check, in Order
Cold air from the vents with the heat on? The order a technician checks: fan setting, burners, limit trips, flame sensor, vents, gas supply and ductwork.
Read the guideHow Long Does a Furnace Replacement Take?
A straight furnace swap is usually done in one day. Venting changes, a chimney liner, gas line or duct work, and the permit inspection add time. What to expect.
Read the guideContact Us
Furnace repair in North St. Paul? Call or send a request.