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thanks Garry. I just took the PCB cover of and cleaned up the solder joints and it works. Probably means i need a new PCB, but i can manage that. So it was two problems, air in the system and a faulty PCB. Thanks very much.

hi garry, yes there's demand from the controller. Plus when i switch the CH on the boiler slowly i.e. over 30 seconds extinguishes all the temperature lights one by one. So i assume it's using the heat store in the vessel. But the bolier doesn't fire. thanks again.

No the CH demand light doesn't come on. You can't tell the boiler has reacted at all to the CH being switched on apart from what sounds like a pump and the water temperature lights slowly extinguishing one by one. I can't hear any water being pumped through the rads. thanks.

thanks. Doing all the above seems to have helped the noise, but the central heating still won't work. I've made the following further observations. If i turn the heating on the temperature lights slowly extinguish on the boiler until they all go out, but the boiler doesn't fire up. If i then...

I've just toped up the pressure slightly and loosened the screw the air vent screw on top of the pump (but not removed it). It doesn't seem to have helped. How would I "drop the pressure out of the boiler"? thanks to both of you.

Hello i would be grateful of any assistance. We have a potterton Performa 28i combi boiler installed about 6 years ago. We noticed recently that it has been rather noisy when running hot water or when it periodically self runs to maintain the vessel water temp. It sounds like a "girgling"...