I’m new to this forum. I’m currently repairing a mastertemp 400 at a commercial property and have a very strange issue. We recently replaced the gas valve on this heater and now two weeks later it is not working. Currently I’m not getting power to gas valve itself. The ignition control module is functioning and outputting 24v on the valve wire to the control board. We assumed this was potentially a faulty board and I installed test board but still have the same issue.