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I got the full diverter valve on ebay. I put it in today and now everything seems to be working fine. The back connection to the valve was a real struggle to get off. The old valve was quite dirty inside which worries me a bit. I wouldn't want to be changing the diverter again in the near...

Thanks for your quick reply. Am I best to deassemble and try to clean or to buy a new one? The cheapest I can see is £75 on ebay. Is there anything else I ought to check before ordering the part. I had a problem last winter too but I left the boiler on all the time and it sprang into life...

I have a potterton puma 100e. I tried to turn on the central heating but there's no heat reaching the radiatiors. There's plenty of hot water at the taps and the shower. When I turn on the CH the water seems to heat up past the diverter and goes about 1m down the pipe to just before the first...