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Glow-worm Fuelsaver 80F takes 40-50 mins to ignite?

when the system first starts up, the pump runs,the fan run but takes at least 40-50 mins to ignite. Once the boiler is warm it works as normal. A quick thump on the casing also tends to make it work (wifes method) any ideas ?
Hacksaw Sid, October 2008
The air pressure switch is faulty. Needs replaced.

Robert Adam, October 2008
Air flow to aps not activating
Air pressure switch proves fan is running to complete ignition sequence

yas, October 2008
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