WB Heatslave ii not powering up

C

CharlesMagne

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15 Apr 2015
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Somerset
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United Kingdom
After switching my consumer unit off temporarily to check a switch, my boiler (oil WB Greenstar Heatslave ii combi, only a few months old) won't come back on. The LCD is blank and the wireless thermostat had a Fault A21 which just means it can't find its friend. Any ideas?

I've checked the FCU all the way to the boiler which looks fine and has power. I haven't found any obvious fuses inside the boiler which might have blown.

WB are closed until Monday so won't be any help soon. It's starting to get a wee chilly in the house so any help gratefully accepted (not to mention no hot water).
 
are you certain that you have 230v to the boiler?
have you checked the 5a fuse on the pcb of the boiler?
 
I moved house recently and can't find my multimeter so can't be 100% sure, but have tried lamps and other items in the FCU connection, all of which work. I've just had the motherboard out and can only find the one fuse which is accessible from the front which I changed out, still no joy. Couldn't see any burning, melting or poor connection on the mobo. Could be that both the fuses are dud, hard to check without a multimeter. The fact that they provide a spare fuse on the inside of the fascia says it all for me. You don't supply spares unless you expect something to go wrong!
 
most boilers come with a spare fuse, and most boilers get skipped before the need to use them!!!
 
I've got it running off an extension lead, something must be up with the FCU's supply. I'll get hold of a multimeter and check it out. Thank you for your suggestions.
 
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