System: Bryant/Carrier 580AN042100 (580ANW042100AAAG) Pkg. Unit with LP Gas furnace. Equipped with Intermittent Pilot and OEM Johnson Controls Ignition Control Module, #G67MG-4 (LH33CZ (OE 2?)004).
Control cycles through pilot ignition and pilot ignites; pilot produced is a strong blue flame and flame rod glows red. After a short time (approximately 15-seconds) a chattering noise can be heard from the main gas valve, but no gas flows and the burner does not ignite. After about 10-seconds, the pilot is extinguished, and the induction fan continues to operate... unit stays at this condition until line power is interrupted.
Troubleshooting Results: With test meter placed in series with flame rod and flame sensor terminal on module, with pilot burning & rod red hot, two (2) micro amps are generated. The flame rod and wire ohm out OK (not shorted to ground; and no resistance from rod, through wire, to female push on connector). Throughout the sequence, there is never any voltage registered at the MV terminals; with the wires disconnected from the MV terminals, the main valve still chatters (so the chattering dies not appear to be related to anything coming from the module). The ignition module has a good ground.
What should I check next? Thanks.