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thanks namsag - assuming the cam is not going far enough to operate the microswitch is there anything I can fiddle with to help it get there?

many thanks namsag and dal5band for your superb explanations yes dal5band - the water is heating (as long as the central heating is on) so I think it has to be the microswitch which is not operating namsag - from what you are saying it sounds as though the valve may not be opening fully...

Thanks for your quick reply namsag - would this be an electrical fault or a mechanical fault? Would a fault in this motorised valve also be what is preventing the pump starting when the hot water is switched 'on'? The motorised valves I have are Honeywell 8901 - are they easy to replace?

I have a fully pumped gas-fired system with motorised valves controlling hot water and heating. Hot water is stored in an indirect cylinder with a thermostatic control (which appears to be working correctly). Until recently it was all working correctly. Now, if I try to heat the hot water...