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Paul It was the stack inducer fan. Installed new on/off power switch tonight. With both fans running now getting 24.7v @ transformer, 24.2v back from thermostat and 24.0v @ fan limit switch and 119.2v on line load @ fan limit switch. Hasn't miss-fired yet. Thanks to your help I think the problem...

It's a 40VA transformer. With the vent blower off I was getting 26.5 volts out, vent blower on 24.6 volts out and 24.1 volts back from thermostat. I got this after I took the120 power on/off switch out & wire direct. Voltage at the circuit breaker was 118.8 and at fan limit switch 118.2 - a...

Paul, Think you might be on to it. I see my battery backup on computer had kicked on today although the furnace didn't completely fail. I just read 26.7 volts at transformer with vent blower off, dropped to 25.8 with vent blower on and 24.8 with both furnace & vent blower on. Was reading 24 v...

Thanks paul52446m. The gas valve & the electronic board have both been changed out. When it fails the gas valve stays open less than a second and the burner(s) nearest the flame sensor don't light. I am getting 23.7 volts to the gas valve & 24.2 v at the transformer I'm wondering if one of...

Had already checked the water drain as well as the vent fan intake and exhaust pipe for obstructions. Also checked the heat exchanger for cracks. and checked for carbon monoxide in the vent pipe. Service has now changed the gas valve as well but still having problem and are pretty much at a...

I am also having same intermittent problem with my York 15 year old York. Vent fan comes on, gas valve opens, spark igniter heats up, burners do not light all the way across, gas valve closes. Most of the time will stay lit on the 2nd cycle. If not, I have to turn off power. Works fine when...