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Good ideas. I'll try to investigate the filters (and double check the valves). Some kind of blockage seems like a sensible diagnosis to me, especially considering the DHW is fine. Thanks. I'll let you know how it goes.

Thanks for your response. I haven't touched these valves, so I'm assuming they are still open. These problems are not related to my earlier thread, other than being about the same system. The noises mentioned in my previous thread appeared to just be trapped air, and reduced slowly over...

Thanks for the ideas. The reason I replaced the AAV is because I originally thought the noise was air in the boiler.* Since installation, the new AAV has always had its cap loosened (quite a bit). On a couple of occasions, early on, I heard it vent some air, so I think that bit is working...

Hi there, I have a Potterton Performa 24 combi boiler. I have recently drained the system to replace my automatic air vent and to fix a leaking joint (where my CH flow pipe leaves my boiler). Having just refilled the system and bled the rads, I notice now that the boiler flame only...

Ah, cunning plan. I'll give that a go, thank you.

I've definitely concluded the AAV is screwed. It spews water whenever open. I'll have to replace it. The manual refers to "draining the primary circuit". I have a horrible feeling this means "undo the work of the evening and drain the whole CH system". Is that right? I would run the...

Thanks, I'll bear this in mind over the next few days. I just solved the problem, by realising I had tightened up the automatic air vent. I loosened this and restarted the boiler. Almost immediately it was better and now is running ok. I had to close it back down again, however, as it...

Hi again, I've finished draining and filling (and replacing leaking drain valve :D ). I vented downstairs radiators, then upstairs. System is pressurised to 1.25 bar now. I tried to vent the pump, by unscrewing the large screw. A smidgeon of water came out. I then stumbled across...

By the way, should I bleed the pump before or after bleeding the radiators?

Thanks for the tip, I'll give it a go this evening and will post back with results. That is, after I replace this leaky drain valve which is making emptying my system a royal mess.

FYI - I'm currently draining again, with the aim of refilling with some X400 in the system. I'm grateful for any advice on the original question, however, as I'll be refilling tonight and want to pre-empt any problems. I had an experimental tweak on the large screw on the pump, but it...

Hi everyone, I recently drained and refilled my sealed, combi-boiler system. I bled the radiators but did nothing to the boiler. It has an automatic air vent, which I think is open (it is a little raised, seems to possibly bubble a bit). This morning, the boiler started making some...