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Furnace won't light every morning - Trane TUD120R9V5K0
Furnace won't light every morning. I have the Trane mod#TUD120R9V5K0. Power cycling the furnace alone doesn't work. Tapping on the gas supply pipe and then power cycling works sometimes. Wiggling or unplugging/plugging the white 3 wire plug on the gas valve seems to work the rest of the time.
I paid $75 service call to have a licensed HVAC guy check everything out. He was here for about an hour and tested all the voltages, connections, etc and couldn't find a problem. We couldn't duplicate the problem as it was the middle of the day and the problem only happens first thing in the morning.
Any ideas?