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firstly, i doubt that anyone cares seeing as the OP is 3 years old. ANYBODY SEARCHING ON THIS PROBLEM WILL FIND IT, AS I DID, WHICH IS THE WHOLE POINT OF A FORUM - ITS DATE IS IRRELEVANT. secondly, your WPS is probably blocked either in the WPS itself or the orifice to the return pipe that it...

Had same problem - made great discovery. Swapped green and white wires, fitted new drain cock (they grandly call them "pressure relief valve"!). After while Low Pressure Light came on again so swapped wires back to original place - and boiler fixed with no need for new switch ! Sensor had got...