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Sorry for the delay in replying. The new valve is a Hortsmann Z322. The whole storey from the beginning.. The system is approx 30 years old. (Although the pump has been replaced.) On three occasions over the last month the overflow from the header tank has run. The water in the header tank...

I have recently installed a Horstmann 3 port valve. Now the central heating does not work until the hot water reaches full temperature (or the hot water is switched off). The indicator status lamps on the valve show the correct status. (ie HW & CH) for all demand combinations. Any help...