Hi.

I hope someone could help me. I have a York Stellar furnace and I am having a strange problem.

The air conditioning has worked well all summer. However, when I turned on the heat the draft inducing purge motor comes on and stays on. The heating cycle does not continue beyond that. I have 24 volts at the transformer secondary. I checked the thermostat by shorting the R to W and same problem exists. I checked the pressure switch by removing the rubber tube and sucking on it, it does switch and I did a continuity check on it and it does switch. I even tried to get the heat cycle to start by sucking on rubber hose and crimping it while measuring the voltage at the igniter, no voltage.

At this point I am thinking it is the control board, any thoughts would be appreciated. I pretty good with electronics but this has me stumped.

T_Roy

A few more facts, the furnace is about 14 years old. It has a control board and White & Rogers 50E47-50 Ingintion module. LED on module is off, no blinking.