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how can i fix my ariston microgenus 27mffi?

Please can you help me? I ve got ariston combi boiler after been on a minute or so, water gets warm the boiler switches off then starts again about 20 seconds later ,i think it could be down to the secondary heat exchanger needs descaling .thanks for help.
steve, January 2010
For got to add central heating seems to be working alright.!

steve, January 2010
probably the plate heat exchanger requires replacing and a scale reducer installed to prevent reoccurence. check temp sensors and flow switch first

john, January 2010
link Click here to see other fixes for Ariston Microgenus 27 MFFI.