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If its the light under 80 then its the c h thermistor about £10 .

Give it a year or two your opinion about kestons will change . They leak for fun.

Did one last friday took about 1 hour, its not that bad as long as the screws underneath come out , make sure u use plenty of silicone grease. it could be just the front section thats leaking which is a bit easier/cheaper . I agree they sh--e boilers

Should be 20v dc at the gas valve .

Had the same fault on tues changed pcb been fine since.Hope this helps