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Strange: the heating runs fine until the timer switches on the hot water then it trips. If I overide the timer the hot water heats for 5 minutes, an hour, or 3 hours then trips. We`ve been using the emersion instead and last night when the timer/controller (Honeywell) switched OFF the heating it...

The twin impeller Salamander pump that has been working perfectly for 3 years has stopped pumping. It just emits a humm when the shower is turned on but the water comes through at low pressure, unpumped. Is the impeller just jammed and is it possible to free it without disconnecting the water...