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Many thanks for that, the reason the heat exchanger wasnt replaced was he ordered the wrong one and brought the wrong one with him, but once he removed it he said it was clear. I agree it should have been replaced. Boiler has been good for 3 days now, so Im just hoping it stays that way.

Its 9 years old, but now every component has been replaced, so it should be like brand new

My Boiler has a recurring problem in that the temperature D40 measured coming out of the heatexchanger, races up rapidly and the boiler goes into S54 mode and shuts down for 10 mins very annoying if you are in shower, it fires back up after 10 mins. Somtimes it continues to do this and gives a...

Thanks for that, I will mention the water sample as proof of dirty system. One last question, If I choose to clean and flush the system, Ive heard sentinel x800 is a good strong cleaner, but if I power flush 40 year old pipes is this likely to blow an old joint somewhere?

HI Thanks for reply Oct 2009 Diverter Valve and Aqua Sensor Dec 2009 New PLC controller board, Pump and 2 temp sensors Jan 2010 visit from a very patronising man, who told me it was my 1 pipe system to blame and said Vaillant were not prepared to do any thing else untill I replace my...

I keep getting error S54 on my boiler which is shutting it down, no hot water or heating, initially for 10mins at a time, then eventually it sometimes gives an F24. The Valillant engineer has been several times and eventually has blamed it on some work I had on my central heating last year...