Unit was calling for heat. Limit closed. Had 24v to module and pilot valve. No spark at module. Bad module. Will obtain & return. 2/21/17 Found unit off and cool. Unit not in a vacuum. Needs to be vented. Moisture in electrical compartment. Module wet. Wiped out moisture. Steam from steamers getting into compartment through electrical connectors. Sealed up with silicon. Replace module. Heated unit then bled. Filled with cold water. Unit cooled down & pulled vacuum.