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So if the heat exchanger has a blockage, I'm guessing that as the problem has only recently started occurring the blockage can't be too severe? If I were to use something like Sentinel X800 and just leave the pump running for a few days, without the boiler on, to circulate it around the...

The temperature differential is normal for the most part, but when the boiler starts to boil over obviously the flow temperature increases rapidly due to the boiling in the boiler. This is also true with the open vent pipe in the airing cupboard; as the boiler starts to boil over the open vent...

Thanks for your reply. Of course you are right, however I have been through the process of checking the airing cupboard pipework exhaustively. Any blockages I did identify were thoroughly cleaned out using pipe cleaning brushes, and the pipework was replaced. I have run the system with the...

Hello, I have had a problem for a few months now, where my boiler was overheating and pumping over. Initially I thought it to be a circulation problem, but this has been discounted by undertaking a power flush and removing blockages in the circulating pipework. I enquired with British...

boiler exploded view

I've had the system power flushed; I've identified blockages in the airing cupboard and removed the blockages. I have subsequently tested all the peipes in the airing cupboard with a magnet and can't identify any further blockages in any of the pipework that can be accessed. Also, when...

I agree as far as I can tell I have narrowed the problem down to the boiler. If it's not the boiler stat then I really don't know what it could possibly be. Therefore I think I'll try changing the stat before spending big money on overhauling the system. So what do I need to do to change...

Thanks for your reply. The Danfoss Ravi is a 3 port thermostatic valve, so when it closes the circulation goes through the bypass loop, rather than through the hot water circuit in the cylinder. Thus, the system relies on the boiler thermostat to shut itself off. I realise this is an...

Hello, Never posted on this forum before, so please bear with me. A problem occured with our central heating/hot water about a months ago. There was a loud noise coming from our airing cupboard, which sounded like whooshing coming up from the boiler downstairs. This gradually increased in...