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Smart Valve Problem:
I am dealing with a Honewell smart valve 9501 series. The furnace is supplying appropriate 24V power to the valve to the appropriate terminals with a call for heat. Pilot gas and igniter do not engage unless I take the igniter terminal off (2 blue igniter wires and 1 black flame rod wire) off and put it back on. Then the system goes through the proper sequence to main gas and runs fine until the t-stat is satisfied. I have replaced the igniter/flame rod assembly. No change. It acts like the system is seeing flame at the start of cycle and not proving out and sequencing a normal ignition. Flame rod wire in good shape. Flame rod not touching anything. Once I disconnect the 3 wire terminal block, I can hear the pilot valve click in about 2 seconds, and when I reconnect it, the igniter glows and the sequencing finishes. Before I go through the pain and expense of replacing the gas valve, anyone have any other ideas?