Well, the unit has been working reliably for the last few weeks. However, it is acting up again. I am thinking it may be the sensor that is on the blower(?) assembly that sends a signal back to the ignition control block indicating a heat source. I am guessing that this is a thermocouple or similar ...

I don't physically switch the wires, I cross the TH and VALVE terminals on the ignition control block with a pair of needle nose pliers and the unit turns on. I do this when it hangs up. It has been in "working mode" and I put a multimeter on it and initially there is no voltage at the val...

I am concerned because the valve is a bit pricey. I can get the unit to turn on by crossing the TH and VALVE terminals on the ignition control block. I haven't thought to check for voltage at the gas valve terminal, but I will do so. Just wondering if it could be a faulty ignition control.

Thanks for the reply. What needs to be replaced to make the furnace work reliably? This is my primary home so it is in constant use. Tough getting up at 3AM when the unit is running and no heat comes on.

Coleman Evcon Model DGAT070BDC All AC operations function correctly. For Heat: Furnace turns on when stat calls for heat. Bar glows inside fire box, but the flame does not ignite and the main blower does not turn on. It will just keep running like this with no heat. While checking for loose wires o...

Model: DGAT07OBDC Problem: Blower motor will turn on normally or not at all. Normally: Purge motor turns on and I can see ignition through the sight glass. Nice blue flame and hot air is blowing through the vents. Intermittently: Just the purge motor runs, Has a blue flame in the box. Seems like th...