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I have a problem with my central heating not working, due to a faulty motorised valve (I think). When I slide the lever on the valve to the Open/Manual position my radiators heat up nicely. Trouble is, after a while the little lever slips out of open position back to "auto" and they cool down...

Starting from cold (in the morning), my radiators get warmer and warmer until almost hot, then after 20 minutes or so get cooler and cooler, not to warm up again until the next time it all starts from cold. Anyone any idea where the problem might lie ?

My gas boiler is downstairs. The hot water tank and pump is upstairs. The radiator in the bathroom is very hot (though this is not the one closest to the pump). All other radiators (upstairs and downstairs) are lukewarm or cold (warmer at the top than the bottom, I've noticed). Hot water is...