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OK, can I check that manually? When the he is on but the boiler not firing, move the metal lever myself? Thought I tried that earlier but maybe not.

The first zone valve - we have two of them, honeywells. Edit: 2 ports, not the 3 port pictured. Can't remember what the contract is - covers boiler and CH, but not drains etc.

We have a 10 year old or so Suprima 80 which has worked well enough apart from the usual things where it occasionally flashes lights and stops working for an day or so! Always seems to sort itself out though. Anyway, things seem to have come to a head. It seems not to be producing any hot...

I forgot to update this! I contacted Honeywell and they posted me a new unit out FOC, despite it being well outside the warranty. Really excellent customer service.

...or at least I would if their website worked :roll:

Duracells. Just firing off an email to Honeywell now. If I have to I will pay for a replacement controller, but I'm not really up for blowing another £120 on the whole thing...

Having a similar problem with a Honeywell CM927. Bought and installed it just over 2 years ago, and it worked really well until about 6 months ago when the batteries went flat. No bother, replaced the batteries, but they seemed to go flat very quickly too. Had a situation where we came...