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Potterton combi gold 28 HE, fault?

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John Tinton

Good afternoon all, I am a commercial gas engineer so little experience with domestic (although fully qualified). I have a problem with a Potterton combi gold whereas I initially had no heating. I looked at the actuator on the diverter which was not driving so for £12:50 I just ordered a new one. Fitted it but the actuator is still not driving. Then got manufacturers instructions and followed their advice by checking for power from the pcb X3 terminals 5&7 (calling for heat), nothing off the board. Got myself a refurbished (tested and certified pcb). Fitted it but still no power on terminals 5&7 on X3 on the pcb and actuator still not driving (obviously)
Am I missing something obvious here, I am a bit flummoxed.
Hot water is fine btw.
I thank you in advance for any advice 😉
 

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