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Hi All Any help appreciated. Jaguar Combi boiler 28KVT J15 will sometimes work if isolated from mains for a few hours then switched on shortly after being powered up to mains. It will then do it's initial burn until the demand temperature is exceeded, and cycle the flame out, as expected...

Hi all does anyone have an idea how to fix this, or what is wrong. Power up, J1 (software version), Pause, click of relay, LED.s flash once & F3 code, pump running. Will not reset. This is a sudden occurance. System was fine, went away for weekend, System was in Holiday mode. came...