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Hi all, IT WORKS!!!! :D :D Fantastic. Hot water never felt soooo good. The DHW heat exchange (primary side) was full of black scaley stuff. I cleaned it out as best I could and put the boiler back together in order to at least get the CH back. If the DHW didn't work then I would...

Apology accepted. I'm going to check the DHW exchange and will clean or replace as appropriate. I'll let you all know how it goes. Thank you all for your help so far.

Agile, That was a very arrogant way of saying the same thing that Terrywookfit managed to say in a very professional manner. Tut tut Agile. Well done Terrywookfit, and thank you. The explanation was very helpful

I'm not judging your ability, I'm just one of those REALLY annoying people that needs to understand why he's doing something. Why, does a blocked / clogged / dirty DHW exchange cause the burner to turn on and off as it is doing? In the DHW mode diagram on page 7 of the manual, I can see...

Thanks Webrits. The flow charts would appear to only help if the power / ignition wasn't working at all. The burner on my boiler only goes out during hot water run offs. The central heating works ok. Something I did neglect to mention before was the flow switch and the Auto Air Vent...

Hi I've had problems with the hot water on my Halstead Ace Combi Boiler for around 6 months. It started with the boiler locking out during long run off's of hot water. Then around 2 months ago I noticed the baths were cooler. On investigation I found the burner would only stay on for around 1...