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Thanks very much for your help. I'll swallow my pride and go for a professional! Cheers.

It came up with S.30

ecoTEC plus

When I turn the boiler on, I can hear it try to start up - very briefly - then nothing more happens.

You're right about the wires. But I do get a display on the boiler - does that mean that its fuse is ok?

The bolier's controlled by a Honeywell timer. The first time I tried to re-start things after fitting the timer I blew a fuse. Everything's now "working" but the boiler won't fire up.

None. I just took the old thermostat off the wall and fitted the new one.

No the hot water's down too. The thermostat is on the wall in the corridor and should be controlling all the radiators in the house.

I've just fitted a Honeywell programmable thermostat and now my Vaillant combi-boiler won't fire up. No fault message is displaying. Any ideas please?