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Thanks Mickyg - I have had my suspicions about the diverter valve but a plumber on a previous visit discounted it. I will be getting another plumber in shortly and I will get him to check it. Thank for the offer andypenny but the boiler is so old that when it next breaks I think I will...

I have to admit that I have just been living with the problem as it is intermittent and occasional. However during the Summer months when the radiators have not been on it has become more than irritating and I plan to call my local plumber back in a couple of weeks as he did a good job on an...

The system seems to run OK with the bypass gate valve fully open. The pump and divertor valve are next to the cylinder in the airing cupboard. With the bypass gate valve fully closed and only the HW circuit on, the system is noisier but the overheat on the boiler has not tripped out. There is a...

Thanks, will try the gate valve. It seems in reasonable condition. John

PS The pump does run on after the boiler shuts down. John

Thanks Dave, I believe the coil was flushed and found OK. The thermostat in the boiler was replaced as part of a service prior to this saga. The bypass was opened fully by the plumber to allow us to get some hot water without crashing off the boiler while he got around to replacing the pipework...

I have had a 5 month saga with an intermittent problem that my local plumber has given up on. It's a system about 18yrs old with Glow-worm Fuelsaver 80F boiler which works fine when the central heating is running but if the hot water is running by itself there is occasionally a banging noise in...