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Thank you. Already done this and filed the switch down. It tests fine with and without flow. Any other thoughts? Thanks again. Steve

Help! I have a Grant oil external boiler. i'm getting hot water and no heating. It seems that the boiler is calling for hot water constantly as the hot water pump runs all the time. So far I've replaced (with the help of an engineer who has now given up!!) the following on the advice of Grant...