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boiler wont ignite!?

i have a halstead boiler and it was working fine except for DHW fluctuated,, changed the plate and now the boiler will not light although goes throught the sequence,, but can not hear the sparking for ignition?? any thoughts? its freezing!
richard, December 2008
its a halstead wickes 102,,

richard, December 2008
what model is it

b, December 2008
ive drained the system several times and bled every rad,,, pressure up to 2 bar,,, there seems to be no signal sent to ignite? i can light it manually but goes out after its 10 second procedure,,, any help would be appreciated...

richard, December 2008
air in the pump

b, December 2008
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