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 Minnetonka (Hennepin County), about 12 miles from downtown Minneapolis.
Minnetonka grew from 11,896 residents in 1950 to 35,776 in 1970, so most houses sit on hilly, tree-covered lots between Ridgedale, Glen Lake and the eastern tip of Lake Minnetonka. Minnehaha Creek leaves Lake Minnetonka at Gray's Bay and runs east across the city toward Hopkins.
Updated October 27, 2026 · By Eric Brown, owner, Central Minnesota Heating and Cooling

Around town: Ridgedale Center · Purgatory Park · Glen Lake · Minnehaha Creek · Lake Minnetonka. Neighborhoods: Glen Lake · Minnetonka Mills
Book in MinnetonkaMinnetonka's population more than doubled in the 1950s, to about 25,000, and passed 35,000 by 1970, so the city's core is mid-century: ramblers, split-levels and walkouts built on lots cut from woods and old farms. Those houses started with chimney-vented furnaces, and after two or three replacements many now run a 90%-plus furnace with PVC through the rim joist, leaving the water heater alone in the chimney. Houses from the 1980s and 1990s are larger two-stories and walkouts, some with a second system or zoning for the upstairs.
The oldest pocket is Minnetonka Mills on Minnehaha Creek, the first permanent settlement west of Minneapolis in Hennepin County, dating to 1852, where a handful of older houses remain. Since the city filled out, most new housing has been infill: teardowns replaced with bigger homes, plus apartments and townhomes along the main roads.
Hilly lots shape Minnetonka's winter problems. On a walkout, the furnace's PVC vents may exit on the uphill side of the house, where the pipes sit barely above grade and vanish under the first real snowfall; the pressure switch then shuts the furnace down. Condensate lines routed outside instead of to a floor drain freeze solid. Heat pumps on sloped ground need a raised stand so defrost water drains away instead of freezing into a sheet of ice around the base or across the walk.
The main floor and the walkout below it want different things in July. Rooms facing the backyard often have wide windows or patio doors and gain heat all afternoon, while the lower level stays cool and a little damp, so a single thermostat splits the difference badly. A two-stage or variable-speed system runs longer, quieter cycles that pull more moisture out of the air. Houses backing onto Minnehaha Creek or wetlands can run humid in August, and a whole-house dehumidifier handles that better than a lower thermostat setting.
CenterPoint Energy rebates qualifying high-efficiency furnaces, boilers and smart thermostats, and you can use the heating dealer of your choice. Its ducted air-source heat pump rebate applies only when the heat pump is paired with a gas furnace as a dual-fuel system. Xcel Energy covers the electric side, with rebates for heat pumps, mini-splits and central AC; some require an Xcel-registered contractor, so ask about that before you pick equipment.
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 Minnetonka and nearby towns in Hennepin County, about 12 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 Minnetonka 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.
Cottonwood fluff, seeds and leaves mat on the outside of the condenser coil and choke the airflow. The unit runs hotter, pressures climb, and capacitors and fan motors fail sooner. Rinse the coil gently with a garden hose once or twice a summer, keep branches a few feet clear, and have the coil cleaned properly at the spring tune-up.
Yes. A gas furnace draws a modest electrical load, mostly the blower and controls, so a properly sized generator can keep the heat on. It needs a transfer switch or interlock installed by an electrician, never a cord backfed into a house outlet. Modern furnace control boards are sensitive to rough power, so an inverter generator or a standby unit with clean output is the safer choice.
Usually. We measure the space, the door and the service clearance the manufacturer requires before quoting, then pick a cabinet that fits, sometimes a shorter model paired with a low-profile coil. Moving from an 80% furnace to a 96% model also means new PVC venting and a condensate drain, so the route to an outside wall and to a floor drain or pump gets planned during the same visit.
Zoning is worth it in a Minnetonka walkout or split-level when the floors disagree. The lower level stays cool and the upper bedrooms run warm, so one thermostat splits the difference badly. Motorized dampers and a thermostat per level let each floor call on its own, and a two-stage or variable-speed system handles small calls better. For one stubborn room, balancing or a single ductless head usually costs less.
CenterPoint Energy supplies natural gas and Xcel Energy supplies electricity across the city. That decides where rebates come from: CenterPoint for furnaces and thermostats, Xcel for central AC and heat pumps. If you smell gas, leave the house first and call CenterPoint from outside.
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 Minnetonka: Carrier · Trane · Lennox · Goodman · Rheem · Mitsubishi Electric · Daikin · American Standard · Navien · Weil-McLain · and every other major brand
Heat out in Minnetonka? Call or send a request.