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Right... as I siad I replaced the mid position valve, it functions correctly, ie when water is selected it does nothing, when they are both selected it moves to the mid position, and when ch is selected it moves to the H positon. I wired the pump up to a 240v plug and plugged it in. Sysytem...

I tried removing the motor and jamming the valve in the central heating position, it did the same thing. Heated up for about 40 min, all radiators then for some reason the pump stopped. Could it be that the water is bypassing into the hot water tank and the thermostat on that is cutting it out...

My problem is; The central heating was being put on the other day for the first time since the winter. I found that the motor in the drayton mid position valve was burnt out, I replaced this and fired the system up. Everything appeared to be working ok. However after 40min the pump stops...