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Hello all, thanks for all your help. It was the pump for sure. Need to change the air pressure switch though, as it appears to be on its way out. Warm again.

Took out the pump head, sprayed in some wd40 and gave it a bit of a clean. Hook up the power supply before I refit it properly and the pump works fine (it spins healthily) but when I fit it back the boiler still did not start. Does that mean the pump is ok? Also, I noted that there is no live...

Thanks, all. Dave, the nut doesn't come out of the pump, what is aps? The pump did feel hot this morning while I was fiddling about to eliminate problems. With the nut loose and set to ch it spins if I help to turn it but if swithed off and on again it doesn't turn without my help. Can't say I...

My Biasi 24S boiler is 9 years old and so far worked ok (as far as I know) until this morning after I left home. The green power light is lit, the lock out lamp is not lit, there is no pilot light and it wont go through the ignition sequence as per user manual. Very cold and the baby is not too...