A O Smith Water heater Pilot
40 gallon gas with a vent motor FGR
the thermocouple screws into a factory interrupt switch
that connects to two limit switches on the top flue vent opening
I have continuity through the wire and both limit swiches, but
when i connect the limits back into the switch the pilot does not stay lit
If I jump out the switch the PILOT will stay on
Can it be a weak thermocouple that does not
generate enough current to travel through the limits?
The pressure swich is working and it energizes the vent motor when
the burner lights
Check the voltage of the Thermocouple. If it is out of the acceptable range, its bad.
Should I check the Voltage at the terminals that are behind the
What is an acceptable milivolt reading for that valve