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Hi Agile, boiler has been serviced every year. There are only 2 pipes on the boiler??? A plastic pipe that connects to a plastic little tank on the underside of the boiler, and then a metal pipe which is connected on the underside if the boiler also (looks like it has a valve of some kind in...

just remembered, sometimes when the problem occurs, there is a gentle banging noise that comes from the boiler at the same time

Hi Lightning, boiler seems to fire fine. If I move the lever to manual it makes no difference. The valve itself is warm/hot similar temperature to the pipes that it is connected to. I just set it so that the ch was off and only hot water was on, I turned the boiler temp right up (should be...

Hi Tony, I swapped the motorised valves over to check to see if one was faulty or not, but it appears that they are both operating correctly.

Hi I have the glowworm 18hxi boiler and occasionally (more frequently recently) we get only lukewarm water when we run the hot taps etc. This seems to happen more frequently if we have the ch turned up (ch is always on at about 18c sometimes if it is cold we turn it up) The boiler runs 12...