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 Excelsior, MN
Furnace repair in Excelsior starts with a $79 trip charge, waived when you approve it, in late-1800s houses on fieldstone foundations. In the late-1800s houses, fieldstone foundations let in moisture that rusts burners and flue pipe, so rust on those parts and a weak chimney draft are the first things to rule out.
Furnace repair calls in Excelsior homes
Furnace repair in Excelsior happens in some of the oldest basements we work in. Houses from the late 1800s and early 1900s sit on fieldstone or block foundations, with low ceilings and steep stairs, and the forced-air furnace arrived decades after the house was built. The ducts in those conversions thread through closets and old chases, and every repair has to allow for tight clearances around the cabinet.
Stone foundations let moisture in, and that shows up as rust on burners, flue pipe and the bottom of the cabinet. Many furnaces here still vent into the original chimney, and a masonry chimney on an outside wall that cools off between cycles drafts poorly when the furnace first starts. Gas service is CenterPoint Energy's, so a gas smell goes to them first. A furnace service here should include a draft test, a look at the heat exchanger and a CO check around the furnace and flue, because old houses and old chimneys leave less margin.
Updated November 10, 2026
What do common furnace repairs cost in Excelsior?
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: Strange noises · Leaking water · Burning smell · Red tag · Signs your furnace needs a technician
Furnace repair in Excelsior: questions
Our Excelsior house has a boiler and radiators. Do you repair those?
Yes. Gas boilers in older Excelsior homes need their own kind of service: bleeding air from radiators, checking the expansion tank and system pressure, and testing circulator pumps and zone valves. A boiler that runs but leaves some radiators cold usually has air in the system or a stuck zone valve. A written flat-rate price comes first, and we work on Weil-McLain and other common boilers.
Why does the furnace in our Excelsior house run a few minutes, shut off, and start again?
In a converted older house, the usual cause is too little return air. Ducts added through closets and chases often have one or two small returns, and when the filter loads up or a return is blocked, the heat exchanger overheats and the limit switch shuts the burners off until it cools. A dirty flame sensor causes a shorter version, lighting and quitting within seconds. We test both and look at adding return air if that's the root cause.
More in Excelsior
- Furnace replacement in Excelsior
- AC repair in Excelsior
- AC replacement in Excelsior
- Heat pumps in Excelsior
- Mini-splits in Excelsior
- Boiler service in Excelsior
- Tune-ups in Excelsior
- All HVAC service in Excelsior
Furnace repair near Excelsior
- Shorewood, MN furnace repair · 1 mi
- Deephaven, MN furnace repair · 2 mi
- Minnetonka, MN furnace repair · 3 mi
- Chanhassen, MN furnace repair · 3 mi
- Spring Park, MN furnace repair · 4 mi
- Orono, MN furnace repair · 5 mi
Brands we repair
Guides on furnace repair
Lennox Furnace Error Codes: Blinking Lights and Alerts
Lennox furnaces report faults through DS1 and DS2 blinking lights and S30 or iComfort alerts. Learn what they mean and which checks are safe before you call.
Read the guideWhat Is a Furnace Inducer Motor? Signs It's Failing
The inducer motor is the small fan that starts first and pushes exhaust out the vent. Noises and codes of a failing one, repair vs replace, and cost.
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Heat out? AC quit? Call or send a request.