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Hi chaps, Model - Potterton Promax 24HE

Thanks for the post - there are no lights on this promax - just a reset switch. If 'lockout' means it won't fire back up - then yes it locks out! pump runs - stats are calling for heat - but until boiler calls down, it won't re-fire

Any advice please? About 3 weeks ago, I noticed that my Potterton Promax boiler was switching off after about an hour - rads going cold. The only way to fire back up was on the reset on the front of the boiler at which point it would re-fire and then follow the same pattern. Over the space of...