WORCESTER 35CDI II - No DHW or CH

[rossobonks]

Boiler in lock out with the CH light flashing once a second. Fan starts then stops and there is no spark at the electrodes. CH pressure at 1.5Bar and gas present. Any ideas. Tried resetting etc still no joy??

Thank You

Dave

 

[ollski]

slow fan / air pressure switch I would think.

 

[rossobonks]

We blew down the pipes connecting from the fan box to the air pressure switch and it operated the switch correctly......so no blockages and switch not stuck.........??

Dave

 

[B.O.B DOLE]

HAVE YOU CHECKED the flue for blockage if thats ok and the aps is ok its got to be the pcb i would say to check if the board is ok check conti on the green wires on the main multiway connector if conti the board is nackered if open repair harness

 

[ollski]

We blew down the pipes connecting from the fan box to the air pressure switch and it operated the switch correctly......so no blockages and switch not stuck.........??

Dave

So was the aps originally resting in nc when you blew down it?, is the fan creating enough pressure to switch the aps?, is the venturi clear?, can you hear the spark generator clicking?

 

[croydoncorgi]

And be very careful how hard you blow into the vac pipes! The operating pressure is usually around 3 - 5 mBar. If you blow even slightly hard, you may stuff the airswitch!