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I am replacing an old Honeywell T6360B rotary room thermostat with a digital (battery powered) Sunvic TLX 7501. I have uploaded pictures of the wiring for both of them. Please advise on the correct wiring for the new Sunvic. The Honeywell has a Red Live (always 240v), a Yellow switched live...

Had a cold tank dry up, now fixed. But the boiler runs through a cycle of loud bangs, 4 quiet pops, total quiet then starts again over a 5 minute period. My guess is an airlock somewhere. Can anyone advise where I can bleed this from? Or is this a more fundamental i.e. expensive! problem? Thanks

I've looked through the articles but don't see a solution to my problem. I attach two images - one that shows the upstairs two gang switch and one that shows the downstairs two way switch. It is a Hamilton with a single moulded connection block with two rows of L1, L2, C points. In both up...