Glow Worm Ultimate 120 Boiler Neon indicators

10 Jan 2010
Reaction score
United Kingdom
on my Glow Worm ultimate 120 only Neon one is lit. The troubleshooting guide tells me that if Neon 2 is unlit the overheat device has tripped. The fan is running fine but the boiler wont ignite. Can anyone help?

ps. i have two feet of snow and -5 outside - and its sunday!
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when i switchthe boiler to max, neon 1, 2 and 3 are lit but not neon 4. there is no spark at the electronic ignition and the troubeshooter says to check lead continutity and inspect electrode - not sure how to do that.

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