Cracked Heat Exchanger: Symptoms, How It's Confirmed and What to Ask For
Signs of a cracked furnace heat exchanger, how a technician confirms one, what to ask for if your furnace is red-tagged, and when to repair or replace it.
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Furnace Repair in Cottage Grove, MN
Cottage Grove's 1960s and 70s ramblers and split-levels near Highway 61 were chimney-vented from the start, so we check the flue on older furnaces there. Repairs carry a $79 trip charge, waived when you approve the work, with the flat-rate price in writing first. We're open 7 days, 7am–9pm.
Furnace repair calls in Cottage Grove homes
Cottage Grove had two big housing waves, and each brings its own furnace problems. The 1960s and 70s ramblers and split-levels near Highway 61 have basement furnaces vented into chimneys, and the ones still on an older furnace show the classic failures: cracked igniters, worn inducer motors, dirty flame sensors, and belt or bearing noise from older blowers. We check the chimney connection and draft each time, since a masonry chimney that has lost its lining affects the furnace and the water heater.
The two-story subdivisions built after 2000 came with builder-grade furnaces now reaching the end of their first run. Those are high-efficiency units, and the repairs follow suit: condensate traps and drains, pressure switches, inducer motors and control boards. Many were oversized, and a furnace that short-cycles all winter wears out its igniter and relays sooner. Xcel Energy supplies the gas here, so if you smell gas, leave the house and call Xcel from outside.
Updated September 23, 2026
How much does furnace repair cost in Cottage Grove?
Every furnace repair call in Cottage Grove starts with a $79 trip charge, waived when you approve the repair, and a written price before any work. Same prices in Cottage Grove as in every town we serve. National averages (HomeGuide, 2026), not our prices: a control board $300–$650, an inducer motor $400–$1,100, a PSC blower motor $500–$1,400. More in the furnace repair cost guide.
Signs your furnace needs a technician
- The inducer starts, the igniter glows, then the burners never light
- The burners light for a few seconds and shut off, over and over
- The furnace runs but the vents blow cool air
- A blinking code on the control board, or the furnace has locked out
- Your CO alarm went off or the burner flames look lazy and yellow
- New banging, squealing or grinding when the furnace starts
- Water pooling around a high-efficiency furnace
More detail on our furnace repair page.
Symptom guides: Blowing cold air · Won't ignite · Short cycling · Blinking light codes · Pressure switch trips · Strange noises · Leaking water · Burning smell · Red tag · Carbon monoxide
Furnace repair in Cottage Grove: questions
The builder-grade furnace in our 2000s Cottage Grove home keeps needing repairs. Should we replace it?
Look at the pattern. A builder furnace near 20 years old that needed an inducer one winter and a board the next is telling you something, and if it was oversized, it has short-cycled its whole life. Get the next repair priced in writing along with a replacement quote sized by Manual J. If the heat exchanger is sound and the repair is small, fixing it is reasonable. A cracked heat exchanger settles the question.
Who do we call if we smell gas near the furnace in Cottage Grove?
Get everyone out first, without flipping switches or using a phone inside, and call Xcel Energy from outside, since Xcel supplies natural gas in Cottage Grove, or call 911. Don't go back in until the utility says it's safe. Once the leak is handled, we can check the furnace's gas valve, connections and flue, and give you a written price for any repair it needs.
More in Cottage Grove
- Furnace replacement in Cottage Grove
- AC repair in Cottage Grove
- AC replacement in Cottage Grove
- All HVAC service in Cottage Grove
Furnace repair near Cottage Grove
- St. Paul Park, MN 2 mi
- Newport, MN 4 mi
- Inver Grove Heights, MN 5 mi
- South St. Paul, MN 6 mi
- Woodbury, MN 7 mi
- Hastings, MN 7 mi
Brands we repair
Guides on furnace repair
What Does the Blinking Light on My Furnace Mean?
The blinking light on a furnace is a fault code from the control board. How to read it safely, what common codes mean, and when a reset is fine or not.
Read the guideWhy Is My Furnace Leaking Water? Find the Source, Then Fix It
Water around your furnace? Find the source by where and when it drips: condensate trap, pump, frozen line, humidifier or AC coil, and what can't wait.
Read the guideContact Us
Furnace repair in Cottage Grove? Call or send a request.