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Thanks to all for your comments and advice. The Insurance co. contractors have ordered a replacement pump, and another thermostat so I'll wait and see what happens after they've been replaced.

My Promax HE24 boiler has been working OK since new (4 years ago). 4 weeks ago the system developed a problem in that after it has been on for about 12 minutes the boiler switches itself off. In that 12 minutes the hot water and/or CH start to heat up OK. The only way to restart it is to use the...