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Oh, where from? (I know nothing about heating suppliers!).

Thanks guys, It looks like it is that little black box. The next time it stopped, it started again on tapping it again. I'll check the solder connections and if there's nothing to re-solder, I'll get another PCB. I can get a second hand one for £28. Is that an OK price? Thanks for all...

Guess what. Another false hope...! It stopped working again. It started working again when I tapped the black box in the top right of the PCB. Pic here: http://www.hpjw.co.uk/temp/pcb2.htm. Coincidence? I'm not sure. What is this black box? Does it have any moving parts? If not, it may be...

There was 240v at the fan connector of the PCB and one of the connectors in the molex was loose. When I fixed that and plugged it back in, it worked. So either: 1) that molex was the problem :D or 2) it's just randomly decided to start working again for a while! :( No doubt I'll be...

Hmpphhh! Me again... :( Looks like it was option 3. 30 minutes later, it wasn't working again. I switched it off and on again at the mains - no joy. I switched it of and on again on the front, no joy. I flicked the switch again on the front, and this time it fired up... Any ideas...

Hang on, progress! I switched it off the mains electricity supply, pulled out the PCB, noticed that some of the molex's were not pushed fully home (did I disturb them when tugging out the PCB?), switched the power back on and bingo, fan bursts into life (...ah so that's what makes *that*...

Hi, It's stopped working! I'm new to the workings of central heating but I'll do my best to describe what I've managed to work out. It's about 6 years old. The burners fail to burst into life when they should. It started happening intermittently 6 months ago, but it always rectified...