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Goodness me I'd never given that a thought, thank you.

Potterton promax boiler... 5 years installed with problems then out of blue 2 downstairs radiators not heating up. If I turn off the valves of the upstairs 2 then the downstairs 2 get hot. Hot water works fine. Plumber tried thermistor, pump head and also the divertor valve no different. 2nd...