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Just to close off this item - the fault was due to a defective ignition unit pcb Bought a scrap unit on ebay for £12 (also got a free main contol pcb thrown in for free - which had been refurbished) Since then - the boiler has carried me through winter and works very well. So whilst the Jag...

Tony, many thanks for the advice, I do understand your concerns about DIYers - a little knowledge etc.......but Thanks anyhow. Cheers Mark

Well guys, many thanks for the advice - it seems like I'm on the right track - I'll try the cheaper option first!! It just so happens there are 3 scrap Jags on ebay! Thermistors and boards will no doubt be the same so it looks like I have some spares!! I'll let you know what it was - any bets...

I'm tempeted to rip it out - but I hate being beaten! Your old one? got any spares lol

Hi Tony, one last thing, what makes you think its the main PCB rather than the ignition PCB? Cheers Mark

Hi Tony, many thanks, I understand. It looks like I'll go though some trial and error testing then :) I'll start with the flame sensor, thermistors then PCB - cost order lol Cheers Mark

The clip sensor is as factory fitted. This is really troubling me. If the thermistor was failing I'm sure the controller would fail to see the recorded temperature ranges, yet it does? I'm resisting the PCB as this is the most costly option :( Without the service manual (only have the...

Hi to all luminaries..... OK my aged Jaguar has developed a fault after being off for a few months. The system has been flushed (even though a soft water area) all rads OK, pressure spot on (incl gas), delivers hot water fine etc The issue is, from cold it runs up to the max CH temp of 85...