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 Long Lake, MN
Long Lake furnace repair starts with a $79 trip charge, waived when you approve it, for basement furnaces beside the water heater. Many calls trace to a furnace too big for a reinsulated house, and the written price comes before any work.
Furnace repair calls in Long Lake homes
Most Long Lake houses are postwar and 1960s ramblers and story-and-a-halfs that have been reinsulated and re-windowed, so the furnace heating them is often bigger than the house now needs. An oversized furnace runs in short bursts, and all those starts wear igniters, inducers and relays. Short cycles also keep an 80% furnace's flue cool, so condensation rusts the vent connector and can damage the chimney.
The mechanical corner is usually shared with the water heater, the laundry and sometimes a water softener. Dryer lint drifts into the return and the burner area, and bleach or other laundry chemicals stored near a furnace can corrode it from the inside, since the furnace draws that air for combustion. The early-1900s houses near the old main street add tight basements and older ductwork, and the newer townhomes have compact furnaces with their own access limits.
Updated November 10, 2026
What do common furnace repairs cost in Long Lake?
National averages (HomeGuide, 2026), not our prices: a variable-speed (ECM) blower motor $800–$2,300, an igniter $100–$250, a flame sensor $80–$250. More in the furnace repair cost guide.
Symptom guides: Won't ignite · Short cycling · Blinking light codes · Pressure switch trips · Signs your furnace needs a technician
Furnace repair in Long Lake: questions
Does the laundry next to our Long Lake furnace cause problems?
It can. Dryer lint gets pulled into the return and settles on the blower and burners, and a lint-clogged filter chokes airflow. Chlorine bleach, detergents and other laundry chemicals give off vapors that the furnace draws in for combustion, and those vapors turn corrosive in the flame, attacking the heat exchanger and venting. Store chemicals away from the furnace, keep the dryer vent connection tight, and change the filter more often.
Our Long Lake furnace turns on and off every few minutes. What's wrong?
Short cycling has a few causes. A dirty flame sensor makes the furnace light and shut down within seconds. A clogged filter or blocked return lets it overheat and trip the high limit. A thermostat mounted near a supply register or in direct sun cuts cycles short. And an oversized furnace in a reinsulated house heats so fast that it shuts off early. We sort out which one it is before replacing anything.
More in Long Lake
- Furnace replacement in Long Lake
- AC repair in Long Lake
- AC replacement in Long Lake
- All HVAC service in Long Lake
Furnace repair near Long Lake
- Orono, MN furnace repair · 2 mi
- Wayzata, MN furnace repair · 3 mi
- Medina, MN furnace repair · 3 mi
- Maple Plain, MN furnace repair · 4 mi
- Deephaven, MN furnace repair · 4 mi
- Spring Park, MN furnace repair · 5 mi
Brands we repair
Guides on furnace repair
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Heat out? AC quit? Call or send a request.