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:D Problem solved , all caused by poor connection within programmer sending wrong signal to wiring centre . Cleaned contacts tightened connection , problem solved !!!!!

Valves not stuck as I have had the power head off and manually moved it to just heat due alone . When switching between program's the head does not change position and all ports from the wiring centre remain live ? I'm thinking either the printed circuit board in the wiring centre has...

Dan , thanks for the advice ? 💩

Any help gratefully received here please ?

Just a neon tester

:?: I have a glow worm flexi com 30HX with a climapro room stat wired from a smart wiring centre, I also have a 3 port valve. Having had this system running faultlessly for the last 4 years has been wonderful !! .... But this year when I turned of the heating and leaving the dhw just running ...