Biasi M90e 32s Boiler - no ignition spark

[Shafty-Bobs]

Boiler is apprx 3 year old and has stopped working, i.e. not getting any hot water or heating - pls help! The boiler tries to start-up, i.e. the pump appears to run as I have checked by removing the middle screw and the shaft is spinning, however, the fan does not run and there is no spark on the electrodes. After about 30 seconds from starting the boiler the green light flashes frequently - red light (lock out) does not come on.
Any ideas what I can check/fix...?
PS: I've checked the microswitch, i.e. pin goes in and out and I've even operated it manually by sticking a pin to make the connection whilst running hot tap but still not igniting

 

[Agile]

There are many more things to check, some of which need a CORGI, but if they all checked OK and you have two PCBs then the ignition ( right ) PCB is probably faulty.

Have you tested that the flow switch is actually operating the microswitch contacts ( using a test meter ) ?

One assumes you have checked the air pressure test point plugs are in position!

Tony

 

[Shafty-Bobs]

this sounds a bit complicated
time to call a plumber but can't get anybody before Tue

 

[Agile]

They must be a lazy lot up there!

I am going out to a boiler in a few minutes and to two tomorrow!

One of the boilers tomorrow is the same model as yours but I think the gas valve has failed. Its one of the very few landladies who I can trust to pay me after the repair. All other landlords we have to insist on the diagnostic fee in advance!

Tony

 

[Shafty-Bobs]

sorted
it was the fan - now replaced and working fine

 

[Agile]

Glad to hear that its repaired now.

Do you know what was actually wrong with the fan?

Genuine fan failures are very rare on M90 32s.

Dirt in the venturi is much more common.

Tony

 

[lukeykookey]

I had the same problem with my biasi m90e.32s

It turned out that the contacts to the fan were dirty.

Some cold cleaner electrical contact cleaner on the points of that and also the air pressure switch, left for 1/2 hour and it works again. Hooray!

Think I will take it apart and so a hard clean of the points and reassemble just for peace of mind.