I can't reset the lockout. Gas valve does not open or click, Igniter does not light or receive power. Nothing happens. Circuit board has power & air-conditioning mode works implying thermostat OK. Nat gas furnace will not do anything. Igniter measures 70 ohms. The only way I can get diagnostic light to reset is to switch to AC then go back to heat where I get an immediate lockout without anything happening in the furnace sequence of lighting off. Looks to me like the circuit board is bad but I don't if something else could be causing an immediate lockout with inability to reset.
Can anyone help me? I am stumped at this point and don't want to buy a circuit board without some verification. Thanks for anyone's help. Mickey
Can anyone help me? I am stumped at this point and don't want to buy a circuit board without some verification. Thanks for anyone's help. Mickey