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 Scandia (Washington County), about 29 miles from downtown Minneapolis.
Scandia is where the first Swedish immigrants to Minnesota settled, near Hay Lake in 1850, and it was New Scandia Township until it became a city in 2007. Today it is farms, woods, lakes and big rural lots running east to the St. Croix River.
Electric service is split between Xcel Energy and Connexus Energy, and natural gas, which doesn't reach every road, comes from Xcel Energy or Minnesota Energy Resources, so both depend on your address.
Updated October 21, 2026 · By Eric Brown, owner, Central Minnesota Heating and Cooling

Around town: St. Croix River · Big Marine Lake · Bone Lake · Gammelgården Museum · Hay Lake School Museum. Neighborhoods: Village Center · Copas
Book in ScandiaThe 1970s remade Scandia. Population nearly doubled in ten years, from about 1,500 to 2,900, as Interstate 35 opened, land stayed cheap, city families came looking for a rural life and owners turned seasonal cabins into year-round homes. The ramblers and split-levels from that decade have already worn out one or two furnaces. Some still send an 80% furnace and the water heater up a masonry chimney; others switched to condensing furnaces vented in PVC through the wall.
Growth eased after 1980, and about a third of today's houses went up between 1990 and 2015, many with condensing furnaces from the start. The pre-1940 houses include farmhouses and the older homes around the Village Center at Oakhill Road and Olinda Trail. Farmhouses often grew one addition at a time, and heat from the original basement furnace fades toward the newest rooms. Along the St. Croix, federal scenic-river rules keep building sparse, and the shoreland mixes old seasonal places with newer homes.
Scandia winters test the backup heat. On Connexus Energy's dual-fuel rate, the co-op can switch a heat pump off during peak demand for up to 12 hours at a time, and the propane or gas furnace has to carry the house alone, so a tank left low before a cold snap turns into a no-heat call. In the 1970s houses that moved to a condensing furnace, the water heater left by itself in the old chimney can run cold, condense and spill exhaust until the chimney gets a liner.
Field dust, pollen and seed fluff pile onto Scandia's outdoor coils by midsummer, especially where a condenser faces open farmland, and a matted coil makes the compressor work harder every hot afternoon. Lakeshore homes around Big Marine Lake hold humid air, which an oversized air conditioner cools without drying. Converted cabins and the upstairs rooms of old farmhouses often have no ducts at all, and a ductless heat pump head is usually the neatest way to cool them.
Rebates in Scandia follow your address, because two electric and two gas utilities serve the city. On Xcel Energy service, the options include gas furnace rebates, Residential Cooling Rebates and heat pump rebates; Xcel's heat pump rebates generally need a Trade Partner Network installer, so confirm that before you buy. Connexus Energy members get heat pump and AC rebates and a lower heating rate for heat pumps with automatic backup. Minnesota Energy Resources rebates high-efficiency gas furnaces and boilers in existing homes. Minnesota's HEAR and HOMES rebates had not launched as of mid-2026.
Rebate programs change every year; check the utility's current terms before you buy. Our guides: heat pump rebates, what happened to the federal credits.
Central Minnesota Heating and Cooling, owned by Eric Brown and in business since 2009, serves Scandia and nearby towns in Washington County, about 29 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 Scandia 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.
Those are Northern Natural Gas transmission lines, which move gas across the region at high pressure; houses connect only to a local utility's distribution mains. In Scandia that's Xcel Energy, or Minnesota Energy Resources around 182nd and 188th streets, and the city notes gas isn't available in all areas. Ask the utility whether a main extension to your road is planned. Until then, a propane furnace, often paired with a heat pump, does the heating.
Not for the reduced heating rate. Connexus says that rate doesn't work with mini-split systems, because it needs low-voltage control wiring and an automatic, thermostat-controlled backup heat source. A ducted heat pump paired with a propane or gas furnace fits the program, and a mini-split may still qualify for the co-op's ductless heat pump rebate. Part of Scandia is on Xcel Energy instead, so look at who sends your electric bill before counting on either.
Usually not. The furnace sits under the original house, and the addition often hangs off one long duct run with no return, so it loses out to closer rooms. We measure airflow and temperatures at the far registers and check the addition's insulation. The answer is usually more air, through its own supply run and a way back, or a ductless head that heats it directly. A bigger furnace would short-cycle the rest of the house.
Usually the same place as in town: a floor drain, or a small pump that lifts it to one. The water is mildly acidic, so we often add a neutralizer cartridge filled with limestone chips, which protects cast-iron drain lines and septic parts. The volume is small next to what a household sends down the drain. Washington County, not the city, handles private septic systems in Scandia, so check with the county before other plumbing changes.
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 clicking but not lighting? Follow a technician's startup sequence, from power and inducer to igniter, gas and flame sensor, then call 612-429-3465.
Read the guideBrands we service in Scandia: Carrier · Trane · Lennox · Goodman · Rheem · Mitsubishi Electric · Daikin · American Standard · Navien · Weil-McLain · and every other major brand
Heat out in Scandia? Call or send a request.