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If the valve has an isolator switch for power, turn this off or the motor will eventually kick the valve out of manul mode. This happened to me.

My system has a Tower motorised valve which when the system is switched to hot warter only closes. However recently when the system is shut down for a short while and restarted , with hot water still in the system, the valve does not open fully. The valve gkas an indicator on the motor showing...