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Hello, is there a red LED glowing or blinking steady (no error code) on the printed circuit board? Does the inducer fan run?
Thanks, locate the pressure switch, its round, is near the inducer fan, and has one or two 1/4" black rubber tubes and two wire terminals..
then cycle the thermostat again, and when the inducer fan starts, and runs for 3 seconds of so, fit a jumper wire between the two terminals... if the furnace now runs we need to clean or replace the pressure switch.
Thanks, jumper the bottom pressure switch first, the one rated at 1.25" water column,
The other switch closes when the furnace goes to high stage heat and the gas valve goes to high stage, it closes at 2.25" wc.... for now however just jumper the bottom one, you can use a paper clip wire its only 24 volts
Hello again, make sure that you place the jumper *3 to 10 seconds after the inducer fan starts.. not before the inducer fan starts.
so far, assuming that you did the jumper correctly, symptoms point to a bad printed circuit card,
I am off to bed now, I will pick your response up in the morning
The existing spade connectors press onto the switch, you can slide them away from the switch by 1/8" or so in order to enable a better jumper connection