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It was that system yes. They didn't turn off each and agitate as far as I know - they spent some time focused around the boiler as they're sure the HE is blocked. When they were here they took apart and cleaned the pump (powerflusher was connected to pump joints). They showed me and it was...

Thanks for the reply. They were here all day (9-5) and were still cleaning a lot off the magnets towards the end of the day. I'm not unhappy with what they've done so far, I'm just concerned that I may be throwing £800 away if it's not the problem. Very frustrating issue! Should there be...

Hi, Looking for some opinions regarding an issue with my CH. It's a open vented system, 5 rads and a GW HX12 which is nearly two years old and was throwing F22 & F25 errors. I've had someone out; they've cut out the H section which was blocked, and it's been powerflushed. There was an AWFUL...