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microgenus he 28 mffi e34 fault?

Just recently happened, affects both central heating and hot water. Have replaced the Air Pressure Switch, but still keeps on coming up with the same fault code E34. Help please.

Kevin

Kevin Austin
October 2013
Heating, Home Heating Systems28 Fault Water
have you cleared the venturis?

Gas Safe Engineer in West Yorkshire
November 2013

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