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RESOLVED: Just incase anyone is following this thread or has a similar problem the issue was correctly diagnosed by Seco Services as faultly switching by the micro switch in the Actuator, the cam angle on the plastic arm had worn just enought so the micro switch would not engage, slight...

Great stuff thanks Seco, I'll check the micro switch next see if its switching :)

...Yes

Ok re-checked the results with probe on neutral and red probe on colours : White 230v Grey 230v Orange 0 volts.. ?

Hi Seco.....Well With just Heating switch on and Room Thermostat engaged I read: White 0 volts Grey 0 volts Orange 230 volts Hopefully I'm reading this right on the Multimeter ie..Red probe from meter to Live(Brown) then Black Probe to test above colours. The answer to your...

O'h that don't sound good I'll double check tomorrow and get back to you Seco, I've given the Multimeter back to the neighbour now..Thanks for your help.

Yes have 230v on those wires, can the micro switch be just replaced Seco without buying the whole actuator..???

Hi Seco Services... Yes new Boiler PCB fitted today along with Valve Sync Motor and can confirm 230v on the white, grey, orange wire, do you mean the switch in the valve ?

Hi Guys, I've got a Glow Worm 40RR Regular/cylinder Boiler, hot water works fine (and diag neons X 4 light up upon PCB when fired up) But the Central Heating doesn't even fire up and theirs no neon diag lights appearing on the PCB, even the Power diag neon is off on the PCB. I've replaced...