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It seems I've been deserted :( . Thanks to everyone for their help so far.

Anybody?

All is OK with pump o/stat wiring. Any ideas where to go next?

Following the fault finder in the manual it tells me to check the wiring on the pump over-run thermostat. What kind of voltage should I be getting here? Also, is the heatsink paste I cleaned off :oops: critical to the correct operation of the boiler?

I took your advice and bought a pair, the only trouble is I can't get one of the buggers off! The screws are stuck solid and its behind the pump so difficult to get at. However, I've changed the one on the DHW outlet pipe and hey presto we have hot water but no CH. As I couldn't get the other...

The pipe its on is stone cold. I don't understand though if it is this thats causng the fault why we lost the hot water first then the heating later. Nevertheless I will replace it and see what happens. Do you know of any sites where I can buy one from as they are only sold in pairs on the...

The thermistor on the DHW outlet pipe reads around 20 Ohms and the other reads around 20 kOhms. Does this mean they are wired in parallel then?

There are 2 thermistors on the boiler. Will they both need replacing? I don't wish to question you judgement but is there any way I can test this for sure before I order the parts?

The guy who came out tried changing the driver and ignition PCBs but with no luck. As I said earlier he replaced the fan the week before when that went and all was OK which makes me wonder if its a duff fan. But having said that the CH was working OK, we had only lost the hot water a couple of...

Doh! What an eejit! I thought when I cleaned it off, 'Well how did it get there?' Most of it had crumbled away. What can I say? I'm desperate. Anyway, yes it is the pump running, the fan does not start. When hot water tap is opened the plunger on the diverter presses the micro switches so there...

Overheat cutoff is reset. There was a layer white chalky stuff (??) between the pump overrun thermostat and the plate it sits on so I cleaned this off and replaced it, wiring seems OK (10V?), still nothing. What puzzles me though is that the fault finder leads you to the pump overrun for both...

The only thing I paid for was the fan. When the driver and ignition boards didn't work he put the old ones back in. He admitted he was at a loss to explain the fault and didn't charge us anything, which was a relief for my wallet, but we're still knackered for heating/hot water.

Got a problem (or two!) on the Wickes 2000. Any help would be very much appreciated. Here goes... Fan packed up and was replaced, all OK for a week or so. Then we couldn't get any hot water but CH worked fine. Engineer came out and initially said it was the diverter and demonstrated the...