Timmie..

Mitch_4

old bradford white? If there is an ECO in the thermocouple, and you are dropping 12 MV across the terminals, likey the ECO circuit. The old bradfords used spade connectors, I always stripped and soldered them and it cleared up tout suite. Check the ECO circuit.

Mitch

paul lessard_3

I know this is an easy one for you..

I have a water heater with a junction block/spill switch
that reads 17 on the fire side,5 on the terminal side but only 4 on the gas valve side of things. would anything but the j-block be at fault?
thanks for ALL the help!
paul.

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Unknown

Try replacing

the thermocouple and junction block. Mitch also had a good idea to solder any connections to reduce Millivolt loss.