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heat line c24 no heating hw ok

Joined
30 Dec 2010
Messages
3
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Location
West Midlands
Country
United Kingdom
heat line c24 no heating hw ok i have noticed that the black motor tends to activate when there is no demaned for hw hence shutting off the flow to heating causing boiler to heat up and shut down ,could it be the pcb? if so how can i check it or can it be repaired?
 
I would start by measuring the resistance of the sensors!

A very good place to start!

Tony
 

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