diverter valve stuck
diverter diaphragm split or stretched
faulty microswitch
Without knowing what you're doing, you'll struggle to diagnose the fault yourself. Call a heating engineer to take a look.
My guess would be the diaphragm in the pressure differential valve has split. If you know what / where on the boiler this is, you may be able to do some more checks. Let me know.
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by htg engineer » Sun Sep 16, 2007 5:55 pm 