Harvard wrote:
Could be one of the two gas valve solenoids coils going bad (failing open). The solenoid coils should be about 40 ohms each. They have known to be intermittent with temperature.
YEP.
2 typical issues that cause main flame to drop out
Spark electrode...used as flame proofer. Main flame has to engulf it and generate a milivolt signal back to circuit board for power to stay on gas solenoids holding them open.
Bad signal track------either connections on electrode/high tension wire, at circuit board or jumping to ground
OR
bad/weal gas solenoid.........typically inboard one cause water drips from T&P Relief vlave into inside one
