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The boiler is a Alpha cdr18 its about 4yrs old.The system as been in for some time now.I have checked the pump and it is the correct way round.

I am currently having problems with my central heating system.It all started with a few radiators had stopped working.I drained down the system and removed all the radiators and flushed them.I also flushed the system out with chemicals.I refill the system and it works ok for a few days but...