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Just going on my experience of going to numerous glow worm cxi and the like that are about 3-4 years old and completely blocked with sludge after being put on old back boiler systems.....and best practice from BS7593:2006 code of practice for treatment of water in domestic hot water central...

Hi, Definitely needs flushing, and I swear by a Magnaclean also!! Jard

Ok, well if the hot water sensor was faulty the light would flash 4 times a second. There could be a fault on the circuit board,although this would most probably affect the central heating also. The fault is most likely to be the flow sensor, so the boiler is not recognising the flow of hot...

Hi..... Do you get a fault code on the boiler?? ie does the light flash 4 times per second or once a second?? Jard

ok, don't know how much this will help, but i know that number 1 on the unit is hot water off(so satisfied on cylinder stat) number 2 is central heating off, number 3 is hot water on(calling on cylinder stat) and number 4 is central heating on (calling on room stat) do you have 2 motorised...

hi, new to this!! but definitely 99 times out of 100 will be the air pressure switch.