Trane XR 80 furnace blowing cold air
Trane XR80 blows cold air.
Inducer motor comes on, glow bar glows for few seconds than goes out and inducer motor shuts off. Immidiatly after the main blower comes on and blows cold air. Will blow until main switch is turned off. Error code is 9 blinks. Replaced the glow bar and same problem.
Strange part is somtimes the furnace works fine. Ususally acts up at bed time.
check gas valve operation. check voltage at gas valve while and after ignitor is glowing
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