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As I mentioned earlier F18 is a pump timeout error. In my opinion it would most likely be caused by a restriction, a drain issue, or the pump is defective & needs replacing. Sometimes a pump can bench test ok but when it runs under load it can stick or even trip out via the internal klixon. I doubt if changing the pressostat would help you very much.
What we found was that when we gave the waste pipe a good shake a 1 cent coin was lodged at the very end of the pipe creating its very own non return valve. A perfect fit in the end of the waste pipe.
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