Furnace Repair in Whitehall, MT

Long run times at altitude put real stress on components. Igniters crack after tens of thousands of cycles. Flame sensors build an oxide film that weakens the microamp signal until the board shuts the gas off. Inducer bearings dry out. Capacitors weaken and the blower struggles against static pressure it was never designed to fight.

Every one of those produces the same result for you: a cold house. The work is identifying which one, fast, and repairing that instead of replacing three parts hoping one was the problem.

We follow the sequence of operation — thermostat call, inducer start, pressure switch close, igniter warm-up, gas valve open, flame proof, blower on. Where that sequence stops tells us where the fault is before any part comes off the shelf.

Then measurement: incoming and control voltage, flame signal, pressure switch operation, temperature rise, static pressure, capacitor microfarads and limit continuity. We inspect the heat exchanger for cracking and check flue and intake terminations, because a snow drift over a sidewall vent shuts a 90% furnace down in minutes.

Igniters, flame sensors, pressure switches, inducer motors and assemblies, blower motors and capacitors, gas valves, high and roll-out limit switches, control boards, transformers, thermostats and wiring faults, condensate traps and drains on high-efficiency units, and door safety switches.

We also correct the airflow problems that cause repeat failures: crushed or disconnected flex duct, over-restrictive filters, closed registers starving the return, and undersized return paths that trip limits every cold snap.