Central heating won't turn off
On 21/11/2011 16:11, Simon T wrote:
I suspected it might have been a stuck 2-port valve, but having checked
both of these found that neither one (CH or DHW) were stuck and appeared
to be operating fine.
The micro-switch on a 2 port valve could be stuck closed even though the
valve itself had closed which action should have opened the micro-switch
contacts.
--
Roger Chapman
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