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Hi, had a job this afternoon repairing a f75 fault on a vaillant 630, i found a lot of crud in the hose before the filter, managed to flush alot of it out by slightly opening the valves under the boiler and catching the water with elbows and pipes, so its working now. I also tried to remove the...

Hi, Customer has a massive house with ch zones and two potterton suprima's, was complaining of no heating/hot water The boilers are wired with the pump and switched live's in a drayton rb1 relay one boiler had power but the pump didnt, nor did the second boiler from what i...

Hi guys, i'm a central heating enginner and i'm having a bit of difficulty A custermer has a 2 bed flat, with a worcester bosch 24i combi, their flat had 5 old rads, 4 k1 1.2m by 40cm (1 in each bedroom and 1 in the bathroom and the final one in the living room). they also have a 3m by 40cm...