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Boiler is Glowworm 15HXI
Control Panel Sunvic SP2
Thermostat ( room) Sunvic PLX
Have just replaced Sunvic 2701 3 pos valve
the boiler stops operating
have turned heating off on controller and water on and the boiler works fine.
but turning water off and heating on and room thermostat to full the boiler will not fire up.
you can hear the thermostat click!when on full
checked wiring then double checked all seems as it should be,
im not sure how to check room thermostat for power to 3 pos valve
or control panel for +ve feed
got diagram thank you unable to check until this evening due to work commitments, why does work always get in the way!,
you are not required to answer the last question by the way
having now tested my system and checking wiring is same as PDF this is what i have found
when cylinder stat is calling i have 235v going to orange wire of 3 way valve
and 168v going to grey of 3 way valve.
when cylinder stat satisfied or off i have 235v to grey wire and 0 v to orange wire.
when CH calling i have 237v to white of 3 way valve
and 236v to grey of valve.
when CH satisfied or off i have 40v to white of valve.
the plot thickens