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 West St. Paul, MN
Furnace repair in West St. Paul starts with a $79 trip charge, waived when you approve the work, on Xcel Energy gas and electric. Most calls come from houses built in the 1950s or earlier, where a draft and venting check on an old chimney belongs with any furnace service.
Furnace repair calls in West St. Paul homes
Owner-occupied houses in West St. Paul lean toward the 1950s and earlier, so most have been through two or three furnaces, and repair calls come in two kinds. Older 80% furnaces fail at the inducer motor, the pressure switch and the hot-surface igniter, and a shared chimney that's partly blocked, or iced at the top in deep cold, can keep the pressure switch from closing. Newer 96% furnaces in the same basements bring their own list: a condensate trap packed with sludge, a cracked PVC fitting, a pump that quit.
Remodeling is common here, and it causes calls that look like equipment failures. A finished basement can bury the return, a new bathroom can take over a supply run, and a furnace tripping its high limit is often starved for air rather than broken. Along Robert Street, the same cold snaps bring no-heat calls on the gas-fired rooftop units over shops and restaurants.
Updated November 10, 2026
What do common furnace repairs cost in West St. Paul?
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 West St. Paul: questions
A tenant in our West St. Paul rental says the furnace lights, runs a minute and quits. What's likely?
Most often a coated flame sensor. The furnace lights, can't prove the flame, shuts the gas off and retries until it locks out. A plugged filter or a blocked vent can cause similar short runs. Ask the tenant to note any blinking code on the control board instead of resetting it over and over. You'll have the repair price in writing before we start.
We finished part of our West St. Paul basement, and now the furnace shuts its burners off early. Is that related?
Probably. Finishing a basement often covers or leaves out return grilles, and a furnace that can't pull enough air runs hot until the high-limit switch cuts the burners. The blower keeps running, the house cools, and the cycle repeats. We measure static pressure and temperature rise, then find the missing return path. A larger return grille or a new return run usually fixes it without replacing anything.
More in West St. Paul
- Furnace replacement in West St. Paul
- AC repair in West St. Paul
- AC replacement in West St. Paul
- Heat pumps in West St. Paul
- Mini-splits in West St. Paul
- Tune-ups in West St. Paul
- All HVAC service in West St. Paul
Furnace repair near West St. Paul
- Saint Paul, MN furnace repair · 3 mi
- Mendota Heights, MN furnace repair · 3 mi
- South St. Paul, MN furnace repair · 4 mi
- Inver Grove Heights, MN furnace repair · 6 mi
- Newport, MN furnace repair · 6 mi
- Maplewood, MN furnace repair · 6 mi
Brands we repair
Guides on furnace repair
What Does the Blinking Light on My Furnace Mean?
A blinking furnace light is a control board fault code. How to read it safely, what common codes mean, and when to call 612-429-3465 instead of resetting.
Read the guideWhy Is My Furnace Leaking Water? Causes by Where It Drips
Water under your furnace, even in summer? Find the source by where it drips: drain, pump, humidifier or AC coil, and what our $79 trip charge covers.
Read the guideContact Us
Heat out? AC quit? Call or send a request.