Cracked Heat Exchanger: Symptoms and How It's Confirmed
Signs of a cracked furnace heat exchanger, how a technician confirms it with a camera and CO readings, what to do after a red tag, and repair vs replace.
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Furnace Repair in Mounds View, MN
In Mounds View, a furnace repair visit costs a $79 trip charge, and we waive it when you approve the repair. Most furnaces sit in an open basement corner of a 1950s–1970s rambler, where a shared chimney can trip the rollout switch.
Furnace repair calls in Mounds View homes
Mounds View's houses mostly date from the 1950s through the 1970s, and the furnaces in them are on their second or third round. Basements tend to be open, with the furnace in a corner near the water heater and often the laundry, so repairs are easy to reach. The trouble spots are older than the furnace. Chimney-vented 80% units share a flue with the water heater, and a partly blocked or deteriorating chimney can trip the rollout or pressure switch. Thermostat wiring is often an old two-wire run from the original heat-only system, and a new thermostat installed without a common wire can drop out and leave the furnace idle.
Blocks rebuilt after the 1965 tornado have late-1960s houses with the same patterns. Apartments and duplexes along Mounds View Boulevard bring shared basements and more than one furnace. Gas here is Xcel Energy's, so if you smell gas, leave and call Xcel before calling us. After that, it's usually igniters, flame sensors, inducers or blower capacitors.
Updated October 27, 2026
What do common furnace repairs cost in Mounds View?
National averages (HomeGuide, 2026), not our prices: a limit switch $100–$375, a control board $300–$650, an inducer motor $400–$1,100. More in the furnace repair cost guide.
Symptom guides: Carbon monoxide · Blowing cold air · Won't ignite · Short cycling · Signs your furnace needs a technician
Furnace repair in Mounds View: questions
Our Mounds View furnace sits right next to the washer and dryer. Does that matter?
It can. Dryer lint loads the furnace filter and settles on the burners, and vapors from bleach, detergents and fabric softener pulled in as combustion air can corrode the heat exchanger and vent parts over the years. Keep the area around the furnace clear, store laundry chemicals sealed and away from it, and check the filter more often. If the furnace has been short-cycling, lint in the burners and corrosion in the cabinet are the first things to look for.
Is it safe to keep running our older Mounds View furnace?
It can be, if it passes a safety check. Age alone doesn't make a furnace dangerous; a cracked heat exchanger, a failing flue or a blocked chimney does. We can check for carbon monoxide around the furnace and flue during a repair, and a technician can shut off a furnace that isn't safe. Minnesota law also requires working CO alarms within 10 feet of every sleeping room, so test yours.
More in Mounds View
- Furnace replacement in Mounds View
- AC repair in Mounds View
- AC replacement in Mounds View
- Heat pumps in Mounds View
- Mini-splits in Mounds View
- Tune-ups in Mounds View
- All HVAC service in Mounds View
Furnace repair near Mounds View
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- Circle Pines, MN furnace repair · 3 mi
- Shoreview, MN furnace repair · 4 mi
Brands we repair
Guides on furnace repair
Best Furnace Brands for Minnesota Winters (2026)
Furnace brands for a Minnesota winter by tier: Carrier, Trane, Lennox, Rheem, Goodman and Amana, what matters more than the badge, and $4,500–$9,500 installs.
Read the guideFurnace 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.
Read the guideContact Us
Heat out? AC quit? Call or send a request.