[troubleshooter101]

I have a Bryant Furnace Model 383KAV042091
At the beginning of the summer the air conditioning would not come on so I installed a knew thermostat. It came right on. Now as winter approaches we switched to Heat and the furnace will not come on.
The air conditioner works, when I flip the switch to cool , the fan motor runs when I flip to "Fan" at the thermostat.

I did a test on the board test tab to com 24 (while having red wire from thermostat disconnected.
LED light blinks 1 short 1 long 4 times then the inducer motor comes on, seems to run fine, igniter glows, fan kicks on, lower speed then to higher speed, test is over.

When I have the thermostat calling for heat inducer motor does not start up. I can not check the voltage at the pressure switch which I believe is suppose to be 24v DC.
Just looking for method of attack, not sure which comes first the chicken or the egg.
Thermostat calls for heat, should the inducer motor start before the pressure switch, before the igniter I thought maybe it was a stuck inducer motor relay if in fact that is what is suppose to start up first. The best I can tell the relay is on the PCB.. I really hope I do not need to replace the PCB looks like over $250.. but you got to do what you got to do. It gets rather cold in Northern Indiana

[labman]

Go to the sticky at https://www.askmehelpdesk.com/heatin...ons-58313.html
And work your way through the sequence of operations.

[Nooner]

Did you remove the jumper wire on the t-stat between rc and rh? There should be one there.