Finally got central heating (!) - Worcester Bosch 28SiII but have a problem - anyone care to hazard a guess at the cause ? (flow switch / duff flue fan perhaps ?)
The DHW side didn`t always work as it should, ie. the boiler would fail to fire up correctly - I think the fitter said something about a fan not switching speeds as it should - but it would sometimes kick into action if left running for a while.
On top of that, it locked out three times on the same night as it was commissioned (yesterday) when the DHW was NOT being used - with the ignition failure / boiler overheat warning code.
He spent quite a while trying to troubleshoot it during commissioning, but had already suggested it would be one for a Worcester Bosch engineer to look at as he was running out of things he could do with it.
On the bright side, I rang Worcester up today after speaking to the installer and they`re coming out tomorrow morning - that turn-around time is impossible to fault !