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hi, Just turned all lockshields a couple of turns, the radiator is blazing now. Thanks for the info. Fethey

Hi All, This has been bugging me for 12 months, here goes; I had a conservatory built onto the back of my home complete with a new radiator with a thermostatic valve. The hep 2o plastic piping was T junctioned from the nearest radiator in the dining room (roughly 4 feet away) and fitted...

Swapped PCB yesterday and it now appears to be working fine with no strange noises. Thanks to all for your posts.

Spoken to a plumber this morning and he agrees with corgiman. I am going to put in a new PCB tomorrow. I will let you know the outcome. Thanks to all.

How do I check the 3 port valve? When the system is calling for heat, this noise just keeps going on and on and the boiler does not fire up.There are no lights illuminated whatsoever when this noise occurs. Any info would be appreciated.Ta.

Think I am going to have to get a plumber/engineer to the boiler. The trouble shooting guide is telling me to change the potentiometer, as the bolier does nothing when the pcb is making the chattering noise. When the bolier is working I think I am going to have difficulty explaining the...

I am clearly out of my depth. ACL 3 port valve means nowt to me bax. Other than a straight pcb swap, I am struggling without some education.

Are the relays easy to swap? I have had the pcb out to check it with no probs.

The noise is definateley from the PCB. The noise is very audible and I can only describe it as electrical drone with some light electronic clicking which is less audible. I suppose it could be described as a chattaring noise.

My baxi boiler has a droning/switching noise from the pcb. There are two different scenarios: 1. When the system is calling for heat the droning /switching noise starts for two minutes, then the boiler works fine with no noise. 2. When the system is calling for heat the...