biasi m90e 24s

2 Dec 2009
Reaction score
United Kingdom
my biasi m90e 24s riva compact. please help the boiler fires for a few seconds then goes out on both ch & dhw.only thing it will do is burn for upto 20 mins if power switch off for about 12
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check for reversed polarity, also rectification probe and lead to pcb having continuity if all ok then youll find its the ignition board.
if your boiler works o.k if you leave it off for a period of time , it sounds like you do have a pcb problem , but check what voltage you are getting to the boiler , i had a similar prob' some time ago max voltage to property should be 253 volts . in my case got 260 volts pcb would overheat & shut down .cool down & than work for a while e.t.c .

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