I would have thought if the continuity checks out on the gas valve, the engineer then tested the pcb? Promptly sold me a $, brand new furnace the techs who. we do not practice coming back for the same problem. Great group here , fast and reliable ! We complete over , jobs annually with returning customers accounting for over % of our work – their satisfaction ensuring both customer loyalty and a reputation which few other companies can match. Awesome hub with really useful tips thanks for sharing!.