D
Dotty
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Biasi M96(24/28)SM/C2
Round black APS
boiler fires up for a few seconds then goes off, continues to spark. After a few attempts the lock out led comes on. Works when the combustion chamber is off.
check flue was fitted correctly as the white seal bends when pushing the elbow into the flue and doesn't sit right.
Fault only starts after the warrenty period is over
Remove the complete flue clean and pour water in the top of the boiler to clean out the heat exchanger. Done 3 of these in the past year.
Ideal icos LF code
Clean the electrodes
Attended a 24ri a few days ago with just the blue light flashing - would not fire & was working up until yesterday.
Worcester fault sheet suggested:
Gas pressure
Co2 levels
Electrodes
Gas coils
Possibly pcb.
In other words could be anything.
I picked up a set of electrodes & a gasket.
On removal the rectification electrode was a bit short but the electrodes were sparking.
Removed the fan & found part of the rubber flap in the air-gas mixing chamber was missing. The other bit had passed through the fan & was sitting in the bottom of the burner.
Another merchant visit new flap installed & boiler rebuilt.
Still exactly the same fault.
Both coils tested & good resistance 35v being sent by board so all ok there. Gas pressure 23mb but noticeably no drop when the boiler was trying to fire. I would have expected a good 1 or 2 mb drop when trying to fire so deduced that the gas valve had also failed. Fortunately had a spare in the van which does several of the Worcester range.
Factory reset as a start point & apart from 440ppm it fired.
All adjusted to book Co2 settings.
In all about 5 hours including merchant visit.
So the fault sheet was more or less correct in that all those things were wrong with the exception of the pcb.
A bit unusual to get 3 parts fail at once, fortunately the customer was perched on my shoulder & could see each faulty part as they were uncovered.
Regards
Arthur
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