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Thank you - what info do you need?
The boiler shuts down if the hot water control is switched on but works fine if just the central heating is on. Problem is no hot water.
Assumed it was motor - Honeywell - but clearly not.
Can anybody help please? Fault just appeared this week. When I switch on the central heating at the timer, the boiler fires up. If I then switch on the hot water the boiler stops. Have replaced the motorised valve but still nothing.