Worcester Bosch 28CDi filling loop

29 Nov 2008
Reaction score
United Kingdom
I have a problem with the pressure valve on the filling loop. The grey knob which normally turns the spindle to pressurise the system just turns and the spindle doesn't. There does not seem a way of tightening the knob on the spindle. Help!
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New knob required but spindle can be turned to fill system using pin nose pliers
Mine has been rubbish since the day it was installed - always leaks all over when filling the system or topping up - also when closing the valve, when it gets tight, the knob just spins. - Faulty design maybe?

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