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ok great, thanks for that...it was the flow sensor. replaced the grey unit for the black one and it's working ok now. all the best

Ok, I'll be able to test for DCV on the pink wire tomorrow. Gave up for the day now. :roll: I just want to understand why the boiler didn't ignite when i shorted across the connections in the flow sensor's plug. And yes, It is the Grey Flow sensor unit. Thanks MickyG for the accurate...

Hi, As per subject title, I have the symptoms of a faulty flow sensor: Boiler's not firing when hot water tap is opened. I removed the flow sensor and tested for continuity across the pins of the with a multimeter....whist running water through the sensor. At first I got...

Firstly Id just like to say thanks to all that help on here. I really do appreciate the help I've already had even before adding my first post to this forum! I am fairly competent with this kind of stuff, and got a call today from my sister and brand new nephew ...complaining of no hot water...