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Thanks for all your help, I've since found the pump does not turn when pcb puts mains on to it on switch on ( windings gone ). Found a pump head replacement awaiting delivery. Out of interest, why is the pump spun on initial switch on with no heating / hot water demand. Is it a routine or a...

I have a Glow worm Flexicom 30cx that displays the F9 fault when switched on with no hot water / heating demands. It makes a few clicking noises but faults out after about 30 seconds .The manual says the pressure sensor or wiring or pump is seized. The pressure sensor reading is OK and varies if...