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So could it be the thermostat.

Think i'l give it a go, Just a last note turned the DHW temp down last night and managed to run a bath at a reasonable temp. temp seemed to stay constant, the problem only occurs if i increase temp. Would this still indicate the heat exchanger to be the problem.

Thanks. Would this have to be done by a corgi fitter, or could I DIY without having to disconect gas.

Thanks dcawkwell. It has started quite suddenly, would there be any other symptoms. Or checks I could do to say for sure. And what's an engineer likely to charge to fix.

Heating works fine. Would heat exchanger need replacing or just cleaning. I was hoping it would be something simple like a thermostat. What sort of price am i looking at ?.

Hi, first post on the forum. My 4 year old Sabre HE (25 I think) has started playing up. The water runs hot for 20-30 seconds then goes cold. It seems to run hot longer if I turn the temp down. The heating works fine. All seems to function as it should, fires up, pressure at 1.2 bar, lights...