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thanks. i will check it out tonite. I don't think it can be programmer as this has already been replaced with new. The lever on the valve does seem to switch as it should between h-m-w, so i though this means that it is working ok.

Hello hope you can help. I have a hw system that regularly has been tripping the whole house elec circuit on firing up. I thought the programmer was to blame which i replaced. Still no change. I tried isolating everything and believed the problem to be the cylinder stat. Which i have also...