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This is really great info, thank you for being so thorough. For the below, I get 22v when the valve is being called to open “ You can check for voltage between the top 24 VAC terminal on the Fenwal ICM and the VAL terminal on the ICM when the gas valve is powered. If the resistance is low...

Thank you for all the info. I’ll check all this in the morning and report back.

Original PCB has corrosion. Original problem was the heater wouldn’t ever ignite, Fenwal would flash 3 times eventually. Replaced igniter, same thing. Measured gas pressure and noticed it never dropped, also noticed I never smell gas so assumed it was a gas valve issue.

No sound from the gas valve. The originaI valve did click. Replaced with a know good used valve, no sound but same voltage drop. Now have replaced with branded new valve, same thing. All of this was with old PCB. New PCB now but same voltage drop, no noise. I have 8” pressure but it never...

Thank you for the welcome and the quick reply. Here is what I get: TH to GND = 22.5v IND to GND = 22.5v VAL to GND = 9v with valve wired up and 22v without valve wired up Thanks

Hello, new here and after lots of google searches decided to ask for help. I have a Pentair Mastertemp 250 gas heater that I’m having issues with. I am thinking the issue is with the gas valve. I’ve replaced the gas valve and the control board but am still having the issue. I get 24v to the...