Worcester Bosch 280 HW problem

26 Apr 2004
Reaction score
United Kingdom
Heating is working fine, but I have no hot water when the tap is turned on full. When I turn on the hot tap a bit, the boiler fires up and I get hot water, but the more I turn on the tap the colder the water gets, the boiler stays on but the water goes cold. If i reduce the flow the water goes hot again. Any ideas?
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with the radiators cold, switch on the hot tap. allow the boiler to fire for a few minutes and then feel the ch flow pipe from the boiler. If it's hot from more than about a metre away from the boiler then the problem is more than likely your diverter valve. If it's not then it could be a blocked/fouled dhw heat exchanger or faulty thermister (reducing the gas too early).

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