Furnace Limit Switch Tripping? What to Check First
Why a furnace high-limit switch keeps tripping, a symptom-to-cause table, the checks to do yourself, the order a technician follows, and what the fix costs.
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Central Minnesota Heating and Cooling repairs and replaces furnaces, ACs, heat pumps and boilers in Red Wing (Goodhue County), about 46 miles from downtown Minneapolis.
Boilers, radiators and tall brick chimneys still heat much of Red Wing's 1800s housing below Barn Bluff and Sorin's Bluff, with ramblers farther out. Wheat, pottery and shoes built the city, and 16,547 people lived here in 2020.
Updated October 27, 2026 · By Eric Brown, owner, Central Minnesota Heating and Cooling

Around town: Barn Bluff (He Mni Can) · Mississippi River · St. James Hotel · Sheldon Theatre · Hay Creek. Neighborhoods: Downtown Red Wing · Burnside
Book in Red WingRed Wing's 1800s neighborhoods climb the slopes between the river and the bluffs, and many of the houses are large: brick Italianates, Queen Annes and later Craftsman homes built as wheat, pottery, leather and shoes brought money into town. Hot-water or steam heat went into many of them early, and the pipes, radiators and old insulation that came with it are still there. Basements are often split by stone foundation walls, which limits where a new boiler or furnace can go.
After World War II, ramblers and split-levels spread onto flatter ground, and the city later grew into areas such as Burnside and out along the Hay Creek valley, where homes range from 1960s ranches to newer two-stories and acreage. Sloped lots are the constant: a walkout on one side, a buried wall on the other, and outdoor units set on a deck or raised platform to stay level and above the snow.
Winter wind comes off the Mississippi and down the valleys, and houses on the bluff slopes take it broadside. Tall brick chimneys on older homes cool off fast, so an old furnace or boiler venting into one can drip condensation and draft poorly on the coldest mornings. Hot-water systems in the big houses need their expansion tanks, air vents and circulators checked before the season. Outdoor units on sloped lots need clearance from drifting snow and from ice falling off tall roofs.
The Mississippi backwaters and Hay Creek make Red Wing humid from June on. Older brick houses stay cool for a day or two in a heat wave, then hold the heat for days. Upper floors and finished attics in the big Victorians need cooling most and have the fewest ducts to deliver it, so ductless heads or a high-velocity system are the usual answer. Cottonwoods along the river shed fluff that plugs condenser coils in the lower town.
Xcel Energy supplies both natural gas and electricity in Red Wing, so its programs cover the whole system: heating equipment rebates for high-efficiency gas furnaces and boilers, and electric-side rebates for central AC and air-source and ductless heat pumps. Several Xcel rebates require a registered contractor, so ask whether yours does before you buy. Homes in the townships around Red Wing may heat with propane or have a different electric provider; check the name on each bill.
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 Red Wing and nearby towns in Goodhue County, about 46 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 Red Wing 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.
Usually not. Banging in a steam system most often comes from water trapped in pipes that have lost their pitch, or from a boiler running at more pressure than a house system needs. We check the pressure control, which should be set low, along with the main vents, the radiator vents, the pipe pitch and the boiler water level. Fixing those often quiets the system without replacing the boiler.
On level, stable ground out of the path of melting snow and roof runoff. On bluffside lots that often means a raised pad or a wall bracket, set so drifting snow and ice from the roof can't bury it. Heat pumps need extra clearance below for defrost water. We also keep the refrigerant line run as short and simple as the slope allows, since long runs up a hill add cost.
Most should keep hot-water or steam heat. Radiators give even, quiet heat, and running new ducts through brick and plaster is costly and disruptive. When the boiler fails, a correctly sized modern boiler reuses the radiators and piping. Cooling is a separate project: ductless heads or a high-velocity system handle it without disturbing the heating. Converting to forced air makes the most sense during a gut renovation.
Leave it alone until it's tested. Old boiler and pipe insulation in houses this age may contain asbestos, and it's mainly a hazard when damaged or disturbed. If a boiler replacement or pipe work would disturb it, have it tested and, if needed, removed or encapsulated by a qualified abatement contractor before we start. We plan the install around that timeline so the house isn't without heat any longer than necessary.
Why a furnace high-limit switch keeps tripping, a symptom-to-cause table, the checks to do yourself, the order a technician follows, and what the fix costs.
Read the guideHow a dual-fuel heat pump and furnace system works in Minnesota, and how to set the switchover temperature from your own gas and electric bills.
Read the guideFurnace quit in a cold snap? Learn how to clear an iced PVC vent safely and stop it from recurring. If it won't stay lit, call 612-429-3465.
Read the guideBrands we service in Red Wing: Carrier · Trane · Lennox · Goodman · Rheem · Mitsubishi Electric · Daikin · American Standard · Navien · Weil-McLain · and every other major brand
Heat out in Red Wing? Call or send a request.