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Just letting you know what happened with this. It was the pump. Restarted it, by giving it a'love tap' whilst the system was on constant setting. I.e. a firm, but not too hard, tap on the front of the pump with the back of a wrench. So pump is running now. Looking at replacement options...

Cheers ACL It's a baxi bermuda back boiler, with a thermostat on the boiler. Open vented system, and a manual 3 way valve (bit like the Rega Diverta, but even older). Boiler comes on for 5 minutes, then switches off. If I turn the thermostat up it comes back on. I presume its over-heating...

Central heating has packed up on Boxing day... getting a bit chilly now No CH or Hot water. Boiler is working. Fires up fine. I believe it may be the pump, as totally silent. I'm wondering whether its electrical, i.e. the timer. Its an old Danfoss 103 clock affair. The timer has been...