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Worcester Bosch combi boiler 24Si II - hot water from taps but not shower!?

Hi
Please can anyone suggest a solution to the following:

My hot water seems to be ok - radiators come on, hot water from taps at the sink and bath. But when I have a shower the hot water only lasts a minute or two and then turns cold and the 24SiII 'Lockout Indicator Lamp' starts flashing. I hold it down to reset, but the problem keeps recurring. System pressure is between 1 and 1.5
Cheers for any help...

Keith
March 2009
WorcesterHeating, Home Heating SystemsBoiler Combi Worcester
try running your shower without the head on and see if the boiler cuts out then,your shower head could be restricting hot,could also be blocked filters in shower or dodgy thermostat (if its thermostatic) in the shower,all restrict the hot coming through the boiler causing it to overheat.

billy
March 2009

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Worcester 24Si II Boiler: No Hot Shower - Help!