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Looks like the problem has returned, even with four of the thermostatic radiator valves removed, the boiler has worked flawlessly all through summer heating up the hot water alone, but now as it is getting colder my central heating has come on and it has been tripping out on overtemp again. It...

Can anyone help, my Baxi Solo 2 PF40 boiler has started to shut down with the overheat lamp lit. This happens after the boiler has been running for at least 8 hours. Once reset, it will run again for a number of hours before tripping out again, any idea where i should start looking ? Thanx...