Hi all - any help gratefully received. I have an unvented system. The central heating is called for and works but only when the cyclinder thermostat is switched off ( otherwise the pump and boiler switch off). There is no hot water. The 2 port motor valve to the cylinder makes a clicking sound but will not move. Do i need an new motor(£20), port valve(£80) or cylinder thermostat(£20)? If i have left out any info needed, please let me know.
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