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If its S plan, probably one of actuators bouncing...

You need to add a earth wire from back box to light switch.

Boiler is a Vaillant VCW 242

Looks like scale from a leak...

Sounds like fan is catching on case...

Do you have a Combi boiler? Looks like should be, Blues to hive neutral Browns to hive live 1 to hive 1 4 to hive 3 Blacks joined in terminal block

You need a link wire between Live and 1 Regards

Does the pump run in the airing cupboard and pipes get hot?

It's a glowworm ultimate 50

Data plate for boiler is inside on right side of case. Have you vented the radiators?

That was my suggestion, although for clarity use black as neutral and grey as switched. The hive needs a neutral to work and the original controller was a normally open switch only.

As per my earlier advice, Brown to live, black to neutral, link brown live to 1 common, grey to 3 heating normally open. For info, Boiler connections, black in with neutral, grey where black was.

As per my earlier advice, Brown to live, black to neutral, link brown live to 1 common, grey to 3 heating normally open. For info, Boiler connections, black in with neutral, grey where black was.

You probably have no neutral...

But you would use a grey wire as neutral?

Yeah, Unfortunately if your not gas safe registered your not allowed to even remove the boiler case. Is a Combi so grey won't be connected... Existing stat is a normally open switch

Brown to live, black to neutral, link brown live to 1 common, grey to 3 heating normally open. Then you will need gas engineer to alter boiler connections.

The n/o and common on the cylinder thermostat.

The cylinder is heated by a separate zone (2 port valve) from the boiler flow.

It's probably seized on with scale, try wiggling up and down as you pull, it will come off