Baxi Combi Instant 80HE fault

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4 Jan 2014
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Norfolk
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Both 30 & 40 lights flashing.
Noticed condensate trap had an inch of milky liquid in it.
Reset boiler for a good 30 seconds at which point it came back to life (a 5 or 10 second reset didn't do it). Boiler then just ran and ran, couldn't make it fail.

However...

24 hours later same problem??
Does the milky liquid suggest the condensate is backing up into the heat exchanger... and by the time I get there to investigate it has drained off?

TIA, Nick
 
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Of the 1000s of these boilers I've worked on I've never seen milky condensate (indeed Baxi Tech said they'd never heard of it and some dust or plaster must have blown into the flue)?!!

However, you're right about the PCB. 30 & 40 lights flashing together indicates this apparently - replaced, all ok.
 
From what I've heard, boilers with aluminium on heat exchanger and flue path can react and corrode slightly to condensate water. I'm sure the 80 and 105 have aluminium inner flue, same as there heat only solo and promax boilers. There latest combi all use plastic inner flue which should keep condensate clear?
 
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