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Thanks for your reply! I have checked the motor, it works as it should and moves correctly on demand. Could the P-HEX, if blocked cause excessive pressure from the pump causing the seating on the spindle of the diverter valve to lift and cause the CH flow pipe to heat-up? Can anyone confirm...

Hope someone can help? I was called out to this breakdown today (just started boiler breakdowns after 12 years of installing)! Symptoms... CH flow pipe heats when any hot water outlet is opened. Only 1 hot water outlet (kitchen sink, closest to boiler) operates at a constant temperature...