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Hey Mikey, If you have a pro coming out tomorrow, they should know much more than me. The thing that got me though was when you said that the flow pipe was very hot. That would be an indicator of a partial blockage afaik. Also, as vulcan says, I know some modern boilers don't have diverter...

I had the same symptoms when I moved into a new house with a neglected combi boiler last year. The system was full of oily oxide flakes and magnetite sludge due to neglect (and presumably no decent inhibitor in the water for a long time). The heat exchanger was partially blocked with these black...

Can anyone recommend the best alternative to a soaking in acid for a fouled up heat exchanger made of aluminium? Is there even such a thing, or am I realistically looking at a new heat exchanger? (Some Extra Droffle: My Baxi Main Potterton Combi 24he boiler has gunked up heat exchangers...

Consider this a friendly bump, as I am very far from an expert, but since no one else has replied.. A TRV is much taller than a regular radiator valve, because the temp sensitive wax plug/spring is above the actual valve that opens and shuts, and only connected to it by a thin metal pin/rod...

Hi PD, I new to this stuff, so a bit confused. If you already have a magnetic filter fitted, why do you need the magnecleanse? Does it come with a couple of extra pumps (like a powerflush), or is the magnacleanse just two magnaclean filters in series?

Thanks for your input. I asked because I wasn't 100% sure it was possible for both differential valve pushrods to work with a stuck diverter valve. As an amateur it's always good to have a second opinion.

Hi All, I have a Baxi Main Combi 24 he boiler that is not supplying any hot water at all now. Everything appears to be working nearly correctly. The diaphragm pushrods activate the micro-switches on both the heating and DHW sides of the diverter valve, and the boiler fires up in both cases...