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Yep your right, some of the teeth at the end where it would be open are worn. Not as bad as the pic but they are worn. Does this mean a new valve? or can the rachet be replaced?

Hi On saturday night i was woken by a loud clunking sound. I found that the 2 port valve that controls the central heating was making the noise. I removed the motor part of the valve and the clunking stopped. I thought the motor was screwed in some way so I ordered another (Siemens (Landis...