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 Grant, MN
Furnace repair on a Grant property begins with our $79 trip charge, which disappears once you say yes to the repair, and you get the flat-rate price in writing first. We run 7am–9pm, seven days. On propane homes, we also check the gas pressure and the furnace's LP setup along with the usual parts.
Furnace repair calls in Grant homes
A furnace call in Grant can mean a farmhouse basement, a 1970s house on a two-acre lot, or a newer home on ten acres at the end of a long drive. Propane furnaces use the same igniters, inducers and boards as natural gas ones but run at a higher manifold pressure through smaller orifices, so we measure pressure at the valve and confirm the conversion kit was actually installed. A furnace set up wrong for LP burns dirty, soots the heat exchanger and can trip its rollout switch.
Older farmhouses may still have an 80% furnace sharing a chimney with a water heater, where a weak draft shows up as a CO alarm or scorching at the draft hood. In the 1970s homes, the ductwork is usually original and the furnace a later replacement, so worn inducers, cracked igniters and failed limit switches are the everyday repairs. On open lots, snow drifting over side-wall PVC pipes causes lockouts that look like breakdowns.
Updated September 26, 2026
How much does furnace repair cost in Grant?
Every furnace repair call in Grant starts with a $79 trip charge, waived when you approve the repair, and a written price before any work. Same prices in Grant as in every town we serve. National averages (HomeGuide, 2026), not our prices: a flame sensor $80–$250, a pressure switch $150–$400, a limit switch $100–$375. 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 Grant: questions
The flame in our Grant propane furnace looks yellow and lazy. What's wrong?
Usually a gas pressure or air problem: a furnace running LP on natural gas orifices, a regulator delivering the wrong pressure, dirty burners or blocked combustion air. A yellow, floppy flame burns incompletely and can make carbon monoxide and soot. Shut the furnace off, test your CO alarms, and give us a call. We check manifold pressure against the rating plate, clean the burners and confirm the LP conversion.
Our Grant farmhouse stays warm downstairs, but the upstairs is cold. Is the furnace too small?
Rarely. Farmhouse bedrooms upstairs often get one or two small supplies run up through wall cavities, no return, and an attic with thin insulation above them. We measure the airflow at those registers and the furnace's temperature rise first. The usual fixes are air sealing and insulating the attic, adding a return path, or a ductless head upstairs, and a bigger furnace is seldom one of them.
More in Grant
Furnace repair near Grant
- Mahtomedi, MN 3 mi
- White Bear Lake, MN 4 mi
- Stillwater, MN 5 mi
- Oak Park Heights, MN 6 mi
- Hugo, MN 6 mi
- Lake Elmo, MN 6 mi
Brands we repair
Guides on furnace repair
Frozen Furnace Vent Pipe? How to Clear It Safely in a Minnesota Winter
Furnace quit in a cold snap? How to tell if the PVC intake or exhaust is iced or drifted shut, clear it without cracking the pipe, and keep it from recurring.
Read the guideFurnace Short Cycling: Time the Cycle, Then Find the Cause
A furnace that turns on and off too often tells you what's wrong by how long it runs. How to time a cycle, and what seconds, minutes and frequent cycles mean.
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Furnace repair in Grant? Call or send a request.