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Posted by Phil Booth on February 02, 2004 at 02:47:45:
The combi boiler failed to produce hot water. Investigation showed a faulty wax capsule and a pinhole in the changeover valve. Parts were fitted and it worked for a while then was fine on heating but the pump will not start for hot water. All of the microswitches appear to be functional.
HW is fine while the heating is on (pump running)
I need a circuit diagram and advice please