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Chaffoteaux MX2 30FF - 40 70 fault and 70 80 fault?

Have got Chaffoteaux Maury MX2 30FF and 40 70 code keeps flashing .Also boiler goes off every time the hot water tap is switched on with the 70 80 fault.Can anybody help please?

Ian
December 2008
ChaffoteauxHeating, Home Heating Systems40 70 Fault
Have got Chaffoteaux Maury MX2 30FF and 40 70 code keeps flashing .Also boiler goes off every time the hot water tap is switched on with the 70 80 fault.Can anybody help please?

jose
December 2009

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