My switchmaster SM905 is ticking loudly all the time - Why?
We've noticed the switchmaster SM905 on the wall is ticking loudly all the time for the last week and seems to be getting louder. Can you advise whether this is a sign of the switch about to break down? The heating and hot water seems to be working as timed. We have it on 'twice' per day but sometimes override to constant when needed.
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