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W-M VHE intermittent lockout
I have a 22-25 year old VHE that works fine except about 2 months ago it started locking out around once a day or so. My plumber has tested the system and changed out the ignitor, sensor, gas valve pressure switch relay and two controllers from a honeywell to the white rogers and back to honeywell again. The only part not changed is the blower but that seems to be working fine and the pressure tests out good. All test out fine (but since it is an intermittent problem that may happen). Now he says that the only thing he can think of is replacing the furnace. Could it possibly be a transformer? Also, I did observe one time when it locked out that the system fired up and the flame blew out immediately and the system locked out. It will restart if I cycle the power or pinch the pressure switch tube momentarily. Does anyone have any thoughts for something I can check or look harder at. I believe the furnace is still fine- at least when it fires up. Thanks