Could someone in the group answer this question as to whether my CH system
is correctly wired. To my mind it isn't:-
Its an oil fired boiler, fully pumped with a motorised 3 position (HW, CH &
Both) 5 wire motorised valve, HW cylinder stat and room stat. And a 2
With the programmer calling for CH and HW the 3port valve settles at the
both position and the boiler runs. This is all fine. However if then the HW
cylinder reaches 'stat temperature the whole lot cuts out. To my mind in
this condition the 3 port valve ought to move to the CH position and the
boiler relight until such time that the HW cylinder stat again calls for
Is this correct or not? If not, how do I correct it, and if it is correct,
can I mod it to work as I desire??
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