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Ok. I think i've narrowed this one down. I've taken the motor assembly off the top of the suspect valve to expose the valve shaft. I found that the shaft was loose and would turn easily with finger and thumb. Then to my surprise the shaft came out and the hot water was pouring out! I guess i...

Ok, would you recomend draining and flushing the system then? is it likley that that would clear it?

Thanks dcawkwell, I have tried the levers on the zone valves and with the heating off they both feel the same as regards the resistance and I can latch them open. Also the motor is working when the thermostat is switched. I see what you mean about the balancing but of course everything was...

Here is my problem: I have an oil fired Grant Vortex boiler that gives me hot water and central heating to two zones of the house. There is no problem with the hot water and no problem with the Far central heating (which I think tells me that the boiler and pump is all ok?). The Near...