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Hello We are having problems with greenstar convetional 40cdi boiler. It was hitting 90 temp then cutting out and showing u codes. Enineer discovered its the ehat exchanger n the prob cant be fixed until january 5 unless we pay £900 odds... does anyone know if the system can be power flushed...

Hi, im not very familiar with central heating and water systems. We have had a problem with our boiler where it starts up temp gets hgh so it cuts of temp reaches 90 then drops down to 30/40 and the same cycle again. We had an engineer out who had a look tried to fix it for 2 hrs and then...