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Putting aside whether or not I need to adjust the valve, since it is adjustable I want to know how to adjust it.

I want to be able to adjust the pressure setting.

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...

Update: the upper valve fits TRV3 head (of which I have several, not in use). My system has a mix of TRV3 and 4 valves - must have forgotten this one was a 3 and not a 4 (I blame my age).

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...

I wasn't aware, but I am now, thanks. 3C+E it is then!

oldbutnotdead - the LED lights have got an earth. If one has failed N-E should it be identifiable by a zero ohm reading across the N+E terminals? But what bugs me is why such a failure would occur in a lamp < 12 months old?

SimonH2 - I know the wiring isn't very pretty. The fan I installed is a straight (but different) replacement for a fan previously installed by a 'professional'. I needed to extend the wiring to reach. I take your point about the cable through the gland at the top. I shall replace that with 2C+E...

I see only 3 wires connecting to fan

The fan wires are disconnected at the fan. The wires at the light/fan switch are also disconnected (is this the 'feed' you asked about?)

The water must have come through the gland in the casing that the wires use. The fan is a Manrose Mixed Flow in-line fan mounted on a joist in the loft. It has a timer so runs on after switch-off. But the fan is no longer connected electrically and yet the circuit fault remains.

System is silent!

I disconnected all the poles of the fan. If I switch off main switch, move rcbo to on, then main switch to on, rcbo trips immediately. One more thing: when I removed the cover from the fan terminal block I found a small pool of water in the cover which must have come from the fan itself, since...

No, the device was fitted about 14 years ago. Last year I changed all the lights in the shower room from halogen to LED and installed a different extractor fan.

Perhaps I used the wrong term?

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...

Installer returned today to switch round the two zone valves. Now no water hammer!

Well, no, installed by a local experienced tradesman. But it’s not very clever, is it?

Thanks all for your suggestions. The zone valves have indeed been fitted the wrong way round :(