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csi85 1 year old?

i have two raventheat csi 85 and both give hot water when ch mode is on , but dont work when in the dhw only
any help please
paul
paul barr, June 2008
Sounds like a diverter valve fault, not diverting to hot water when you require it.

Baz, June 2008
link Click here to see other fixes for Raventheat csi85.