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.
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Central Minnesota Heating and Cooling repairs and replaces furnaces, ACs, heat pumps and boilers in St. Louis Park (Hennepin County), about 5 miles from downtown Minneapolis.
St. Louis Park filled in fast after World War II, so its 36 official neighborhoods are full of 1940s and 50s story-and-a-halfs, ramblers and expansion homes on small lots between Minnehaha Creek and the Cedar Lake trail.
Updated October 21, 2026 · By Eric Brown, owner, Central Minnesota Heating and Cooling

Around town: Excelsior & Grand · The West End · Wolfe Park · Westwood Hills Nature Center · Minnehaha Creek. Neighborhoods: Fern Hill · Lenox · Bronx Park · Texa-Tonka · Brooklawns
Book in St. Louis ParkBefore World War II, St. Louis Park was a small village along streetcar lines, and Fern Hill grew up beside the line on Minnetonka Boulevard; about half of its houses predate 1945. Those older homes have more in common with Minneapolis houses of the same age: some converted gravity ducts, some boilers, masonry chimneys serving the water heater. Then the population jumped from about 7,700 in 1940 to more than 43,000 by 1960, and the rest of the city filled with small postwar houses that had forced air from day one.
Since then, most new housing has been apartments and condos, including mixed-use projects such as Excelsior & Grand. For single-family owners, the practical split is prewar versus postwar. Prewar houses raise radiator, chimney and asbestos questions. Postwar houses bring small ducts, low basements, and upstairs half-stories that the ductwork never reached.
On St. Louis Park's narrow lots, snow has nowhere to go. It slides off steep story-and-a-half roofs into the gap between houses, right where the furnace's PVC vents and the gas meter usually are, and shoveling packs it in. A buried intake or exhaust shuts the furnace off. In the prewar houses around Fern Hill, converted gravity systems often have returns under the windows and supplies on inside walls, so rooms with big exterior walls lag behind; weatherstripping the old windows helps more than raising the thermostat.
Condensers on St. Louis Park's small lots end up in tight spots: a narrow side yard, behind the garage, a few feet from the neighbor's dryer vent. A condenser that breathes its own hot exhaust, or lint, runs hotter and wears out capacitors and fan motors sooner, so placement deserves a conversation at replacement time. Houses near Minnehaha Creek can hold more moisture in the basement, and a dehumidifier set at 50 percent lets the AC concentrate on the upstairs.
CenterPoint Energy (gas) and Xcel Energy (electric) run the standard rebates here: CenterPoint for high-efficiency furnaces and boilers with any dealer, Xcel for heat pumps and AC, some only through registered contractors. St. Louis Park adds its own Climate Champions for Homes cost share, which can add to utility rebates on cold-climate heat pumps and heat pump water heaters. It requires a Home Energy Squad planner visit before work begins and a rebate from Xcel or CenterPoint, and a furnace alone doesn't qualify. See heat pumps in St. Louis Park for how Climate Champions works.
Rebate programs change every year; check the utility's current terms before you buy. Our guides: Xcel and CenterPoint rebates, heat pump rebates, what happened to the federal credits.
Central Minnesota Heating and Cooling, owned by Eric Brown and in business since 2009, serves St. Louis Park and nearby towns in Hennepin County, about 5 miles from downtown Minneapolis. We're open 7 days, 7am–9pm, and no-heat calls get priority. Call 612-429-3465.
An HVAC service call in St. Louis Park is a flat $79 trip charge, waived when you approve the repair. You get a written price before any work. Installed prices are on our pricing page.
Most 1940s and 50s story-and-a-halfs have no ducts to the upper rooms, so central air never reaches them. The simplest fix is one ductless mini-split head upstairs, with the line set run down an outside wall to a small outdoor unit. As a heat pump it also helps heat those rooms in spring and fall. New ducts through the knee walls are possible but messier and usually cost more.
The furnace maker's instructions and the mechanical code set the limits: distance from windows and doors, from the gas meter and air intakes, from the neighbor's house, and height above the snow line. On a narrow side yard that sometimes rules out the obvious spot, and the vent goes through the roof or out the back wall instead. We plan the route before quoting so the price holds.
White or gray wrap and tape on ducts in a house built before 1945 can contain asbestos, and you can't tell by looking. Have a sample tested by a lab before anyone cuts, sands or tears it off. If it tests positive, a certified asbestos abatement contractor handles removal, and we plan the new furnace and ductwork around that step so the schedule holds.
Usually not. Running new ducts through plaster walls in a 1920s or 30s house is costly and disruptive, and a working hot-water system gives even, quiet heat. If the boiler is old, a modulating condensing boiler sized to the radiators is the typical replacement. Cooling can be added separately with ductless heads or a small-duct system. Forced air makes more sense when you're gutting the house anyway.
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 guideBang, squeal, scrape, rattle, hum, click or whistle: what each furnace noise means, whether it's safe to run, and when to call 612-429-3465.
Read the guideA ducted heat pump installed by us in Minnesota costs $7,500–$14,500; ductless runs $4,200–$12,500. See what moves the price and which rebates still run.
Read the guideBrands we service in St. Louis Park: Carrier · Trane · Lennox · Goodman · Rheem · Mitsubishi Electric · Daikin · American Standard · Navien · Weil-McLain · and every other major brand
Heat out in St. Louis Park? Call or send a request.