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 West St. Paul, MN
We answer West St. Paul no-heat calls any day of the week between 7am and 9pm, and write down the flat-rate repair price before touching anything. The $79 trip charge is waived when you approve the repair. Many furnaces here still share a 1950s chimney with the water heater.
Furnace repair calls in West St. Paul homes
Owner-occupied houses in West St. Paul lean toward the 1950s and earlier, so most have been through two or three furnaces, and repair calls come in two kinds. Older 80% furnaces fail at the inducer motor, the pressure switch and the hot-surface igniter, and a shared chimney that's partly blocked, or iced at the top in deep cold, can keep the pressure switch from closing. Newer 96% furnaces in the same basements bring their own list: a condensate trap packed with sludge, a cracked PVC fitting, a pump that quit.
Remodeling is common here, and it causes calls that look like equipment failures. A finished basement can bury the return, a new bathroom can take over a supply run, and a furnace tripping its high limit is often starved for air rather than broken. Along Robert Street, the same cold snaps bring no-heat calls on the gas-fired rooftop units over shops and restaurants.
Updated September 26, 2026
How much does furnace repair cost in West St. Paul?
Every furnace repair call in West St. Paul starts with a $79 trip charge, waived when you approve the repair, and a written price before any work. Same prices in West 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 West St. Paul: questions
A tenant in our West St. Paul rental says the furnace lights, runs a minute and quits. What's likely?
Most often a coated flame sensor. The furnace lights, can't prove the flame, shuts the gas off and retries until it locks out. A plugged filter or a blocked vent can cause similar short runs. Ask the tenant to note any blinking code on the control board instead of resetting it over and over. The $79 trip charge comes off the bill when you approve the repair, and you'll have the price in writing before we start.
We finished part of our West St. Paul basement, and now the furnace shuts its burners off early. Is that related?
Probably. Finishing a basement often covers or leaves out return grilles, and a furnace that can't pull enough air runs hot until the high-limit switch cuts the burners. The blower keeps running, the house cools, and the cycle repeats. We measure static pressure and temperature rise, then find the missing return path. A larger return grille or a new return run usually fixes it without replacing anything.
More in West St. Paul
- Furnace replacement in West St. Paul
- AC repair in West St. Paul
- AC replacement in West St. Paul
- All HVAC service in West St. Paul
Furnace repair near West St. Paul
- Saint Paul, MN 3 mi
- Mendota Heights, MN 3 mi
- South St. Paul, MN 4 mi
- Inver Grove Heights, MN 6 mi
- Newport, MN 6 mi
- Maplewood, MN 6 mi
Brands we repair
Guides on furnace repair
How 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 guideFurnace Noises: What Each Sound Means and When to Shut It Off
Bang at startup, squeal, scrape, rattle, hum, click, whistle or a rumble after shutoff: what each furnace noise means and whether it's safe to keep running.
Read the guideContact Us
Furnace repair in West St. Paul? Call or send a request.