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ariston boiler?

fault e34 when hot tap is run will not stay hot
mr b staniforth, January 2011
A problem with the air pressure switch not making all the time ( usually in hot water mode ) or the flue is too long...or remove the flue restrictor - a 50mm dia ring on top of the boiler where the flue sits in

Jon, February 2011
go to ariston web site

brian, January 2011
link Click here to see other fixes for Ariston.