Furnace Won't Ignite: Find Where the Startup Stops
Furnace clicking but not lighting? Follow the startup sequence a technician uses: thermostat, power, inducer, pressure switch, igniter, gas and flame sensor.
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Furnace Repair in South St. Paul, MN
Call 612-429-3465 between 7am and 9pm on any day for furnace repair in South St. Paul. You get a written flat-rate price first, and the $79 trip charge is waived when you approve the repair. Many older furnaces here vent into a chimney the city's time-of-sale evaluation also checks.
Furnace repair calls in South St. Paul homes
About a quarter of South St. Paul's houses predate 1940 and another quarter went up in the 1950s, so repair calls lean old. In the pre-war blocks above the bluff, some houses still heat with hot-water or steam boilers, and the calls there are weeping relief valves, waterlogged expansion tanks, tired circulator pumps and, on steam, low-water cutoffs. Forced-air houses from both eras often have a replacement furnace venting into a masonry chimney.
The vent pipe between furnace and chimney gets extra attention in South St. Paul, because it's on the city's time-of-sale checklist: holes, gaps, a pipe that doesn't run uphill or joints without three screws are marked hazardous. If we find one on a repair visit, we point it out and price the fix alongside the worn igniter, flame sensor or inducer that brought us there.
Updated September 26, 2026
How much does furnace repair cost in South St. Paul?
Every furnace repair call in South St. Paul starts with a $79 trip charge, waived when you approve the repair, and a written price before any work. Same prices in South St. Paul as in every town we serve. 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.
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 South St. Paul: questions
The relief valve on our South St. Paul boiler is dripping. Is that dangerous?
It's a warning, and the valve is doing its job. A weeping relief valve usually means system pressure is climbing past its rating, often from a waterlogged expansion tank or a fill valve letting in too much water, or the valve itself is worn. Never cap or plug the discharge pipe; the city's time-of-sale guidelines treat that as hazardous for good reason. We check the pressure, the tank and the fill valve.
The time-of-sale report on our South St. Paul house flagged the furnace vent pipe. What does the fix involve?
Usually a new vent connector: approved pipe that runs uphill from the furnace to the chimney, three screws at every joint, sealed tightly at the chimney with an approved sealant rather than silicone or latex caulk, and the right clearance to wood (6 inches for single-wall pipe, 1 inch for double-wall B-vent). We finish by testing draft at both appliances. Some hazard corrections need a permit, which we pull.
More in South St. Paul
- Furnace replacement in South St. Paul
- AC repair in South St. Paul
- AC replacement in South St. Paul
- All HVAC service in South St. Paul
Furnace repair near South St. Paul
- Newport, MN 2 mi
- Inver Grove Heights, MN 3 mi
- West St. Paul, MN 4 mi
- St. Paul Park, MN 4 mi
- Woodbury, MN 4 mi
- Maplewood, MN 5 mi
Brands we repair
Guides on furnace repair
Furnace Short Cycling: Time the Cycle, Then Find the Cause
A furnace that turns on and off too often tells you what's wrong by how long it runs. How to time a cycle, and what seconds, minutes and frequent cycles mean.
Read the guideWhat Does It Mean When a Furnace Is Red-Tagged?
A red tag means a technician or the gas utility found your furnace unsafe and shut it off. Common reasons, what not to do, and how to get a second opinion.
Read the guideContact Us
Furnace repair in South St. Paul? Call or send a request.