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My CH system is fitted with a bypass valve (see photo) as my Worcester Greenstar Ri boiler has a 3 minute over-run mode when heating demand stops. But I can't seem to alter the setting on the valve. If I rotate the black knurled collar it doesn't seem to change anything (the scale rotates with...

I’ve recently removed a radiator and replaced it with a new one. To remove the old one I removed the TRV4 head and replaced it with a blue plastic screw-on cap to fully close the valve. Having just installed the new radiator I came to refit the TRV4 head and found the mating screw thread the...

Scenario: lighting circuit serving several rooms including shower room. Shower room light switch also controls extractor fan. After a use of shower room in a morning (no other room lights in use), shower room lights and fan ceased to operate, since RCD had tripped. I disconnected the fan at the...

I've just had a Worcester Greenstar boiler fitted to replace my old Ideal Minimiser SE. The old boiler did not has a pump run-on requirement and so bypass was fitted. This Greenstar does require pump run-on and so a bypass was fitted. But now, when the last zone valve closes with the pump still...

I have had repeated problems with one of my 2 ZA6 actuators, with its microswitch not switching when the actuator is commanded to close the valve. The result is that the pump and burner continue after the flow has stopped. The condensing boiler doesn't like that, obviously. I have sourced and...