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Unique 2 odd fault - intermittant pumping / ground fault

paul waterfield

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has anyone ever come across this strange fault with the unique hazers. I have a few units, both 1 and 2 where the fluid pump isnt operating evenly as though electrical noise is getting in somewhere, though if the earth is disconnected in the front control housing and therefore isolating the processor board from ground, they work fine. I am thinking it is a ground loop, possibly with the thermacouple circuitry though I am at a loss as to why this is happening. I have changed boards and HEMs and still no discernable differences.

Thanks for any pointers


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