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BINGO!!! Found the problem! Firstly a MASSIVE thank you to Dilalio for his help. I left the heating on, but being the chicken-s**t that I am, I removed the decorator cap on the lockshield valve and attached a braided filling loop hose to it. Pointed that into a bucket and opened the valve...

Lovely. Thanks for the quick reply Dilalio. I removed the rad and flushed it out with a garden hose. Water was perfectly clean. The TINIEST bit of black water as I removed the radiator from the wall, but certainly nothing that would clog it up. I've fitted decorator caps to the lock shield...

Hi Folks, We moved into a house 18 months ago. It was built in 2007 and has a 2007 Potterton Powermax HE boiler. Eleven radiators in the house, various sizes. Against our better judgement, we took my mother's advice and turned off the radiators in two unused bedrooms, to prevent heating up...

OK, so I took your advice and went for a fixed-price repair. Called British Gas this morning who said £167.42 all-in, guaranteed for 12 months (existing customer). I was expecting them to say at least a couple of days. They were out within about 6 hours. Turned out to be the PCB (£120 part...

Oh yes, sorry - somebody did mention a powerflush/acidic descale above. I forgot. I don't know much about boilers, but would the engineer be able to check for limescale before proceeding with a power flush? I'd hate to have to fork out something like 180 pounds for it to be flushed only...

According to Northumbrian Water's website, the water is 'SLIGHTLY HARD'. The measurement comes in at: 54 (Hardness in mg/l as calcium). If limescale build-up is the problem, what's the recommended solution?

Thanks for the quick response. When the boiler's on, the pressure sits at about 1.3 bar, when it's off, it's normally at about 0.9 - 1.0 bar. I don't have to pressurise it that often - the last time I did was a couple of months ago when I put back a radiator I had removed when getting...

Hi there, Was just wondering if you managed to diagnose this fault as I'm having the same problem with the same model boiler. I had a plumber come out and look at it. He thought it may have been the air pressure switch and swapped it out for a new one, but the problem was still there...