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I spoke to my engineer and he said that explanation makes sense as I have a gravity fed system and not fully pumped. Most of the broblems I have had before this one stem from blockages in the system which fits in with not enough pressure. It sounds like a day's work and £500 to get it pumped...

Yes that's the b***er. The pump keeps going and it ignites once in a while for a minute or so then goes out again. Does this fit with your diagnosis shambolic?

My boiler is 10 years old and until a year ago no problems with the therm harness. It has been replaced twice, most recently in September, and now looks like it's failing again. Why should it keep doing this? Is it a faulty batch of harness kits or is the boiler at fault? Any ideas please.