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There is a 3 way motorised valve and thermostats on all radiators, i don't know about a 'bypass' though. The boiler is a 'system' boiler as the hot water tank has been retained and this is fitted with a thermostat.

I have recently had a potterton suprima 60l installed. It works fine on hot water only, but when central heating is selected, the radiators heat for about 45 minutes until the boiler trips out (red light on boiler). Potterton have been to check the boiler and its installation and confirm it...