Furnace Won't Ignite: Find Where the Startup Stops
Furnace clicking but not lighting? Follow a technician's startup sequence, from power and inducer to igniter, gas and flame sensor, then call 612-429-3465.
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Furnace repair in Rockford starts at a $79 trip charge, waived when you approve the repair, for damp basements near the Crow River. Basements near the Crow River run damp, which rusts burners, drain fittings and control terminals.
Damp air is hard on a furnace. In Rockford houses close to the Crow River, basements that stay humid or take on water in spring put rust on burners, inducer housings, the bottom of the cabinet and the flame sensor, and corroded connections on the control board cause intermittent lockouts that come and go with the weather. High-efficiency furnaces in those basements also depend on a condensate drain or pump that has to keep working when the floor drain is slow.
The post-war ramblers and split-levels in the middle of town are on their second or third furnace, often an 80% model venting into a chimney with the water heater. The older two-stories and cottages near the river may still have furnaces that replaced gravity systems, with big ducts and tight clearances. Newer subdivisions up the hill have 2000s condensing furnaces reaching the age for inducer, igniter and control board failures. CenterPoint Energy is the gas utility across the whole city.
Updated November 10, 2026
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: Burning smell · Red tag · Carbon monoxide · Blowing cold air · Signs your furnace needs a technician
Surface rust on the outer cabinet from damp basement air is mostly cosmetic. Rust on the burners, the heat exchanger or the vent connector matters more, because it can affect combustion and venting. Water dripping from above is a common source: an AC coil pan overflowing, a leaking humidifier or condensation in the vent pipe. Tracing where the water comes from matters, and a part too corroded to trust should be replaced, not cleaned.
Not until it's checked. Manufacturers and gas-safety guidance say any gas control or valve that has been under water should be replaced, not dried out, because corrosion inside it can keep it from closing properly. Water also damages the control board, igniter, blower motor and burners. Leave the furnace off, keep the power off at its switch, and have it inspected. We'll list what needs replacing and give you a written price for the repair or a replacement.
Furnace clicking but not lighting? Follow a technician's startup sequence, from power and inducer to igniter, gas and flame sensor, then call 612-429-3465.
Read the guideTrane and American Standard furnaces share one control board and flash chart in the maker's guide. See each code, how to read it safely, and when to call.
Read the guideA 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 guideHeat out? AC quit? Call or send a request.