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Hi all recap, Potterton Netaheat 16/22 Mk3 (PCB) thanks for your help. The main solenoid in the gas valve had failed... so had the gas valve changed. However.. after working for a couple of hours it stopped again. :( There is power going to the room thermostat and back to the boiler...

I pressume it's the third type that has the PCB, and the other two don't? do you need to remove the burner rack to change the electrode? thanks all!

Hi thanks for the tips. not a mk1, as there is no phial, just a y piece (pilot deflector I pressume) to carry the flame from the pilot to the main burner rack. The ignition electrode is clean and I don't have a spare here the case seals are good (as far as visible...) Will change...

Hello All I've read the archives, and can see some problems with ignition on the 16/22, but not my specific one. I'm getting the pilot lit, but no main ignition. Gas is good, flu is good, voltage right. Have changed the PCB but same. What detects the pilot ignition? is there a wire...