I have a Superior GHC-5500NE-2 electronic ignition gas fireplace with Robertshaw SP745 ignition module.
When the wall switch is flipped the ignitor clicks and pilot valve opens lighting the pilot but main valve never opens and it all shuts down.
I do NOT see a sensor of any kind with the pilot. What tells the module to send 24v to open main valve (MV)? Is there some type of sensor in the valve?
The SP745 module is older and finding any details on it has problematic.