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Hi, thank you, changed the heating valve motor and all fixed!

Thanks, will replace the CH valve motor and see if that sorts it.

I have an unvented central heating system, there are a couple of problems. The PRV on the cold water inlet is slightly leaking, the water leaking is cold. The boiler is under warranty and we have an engineer scheduled to arrive next Weds to resolve the cold PRV water leak. The system has 2 x...