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The Natural Philosopher
 
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Default Buzzing Central Heating = no heating

Zordiac wrote:

Can someone confirm my suspicions.....snip



Yup. Its a 'motorised valve'

Current drives the motor, the motor opens the water flow AND swiches on
the pump.

The override lever also does the same.

You can get spare motors at nearly all plumbing supply places - take the
old one in.