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DHW fluctuates too much hot/ cold?

I have a BAXI LUNA 310 Fi.high efficiency wall mounted combination boiler.
The DHW cycles toooo low allowing the water temp to get too low.
Q. Is there a setting on the computer that can be adjusted for this or is there a low temp sensor that is responsible for this????????????
Eric, July 2010
this is a common issue with a faulty heat exchanger.they get blocked up!

A1, July 2010
link Click here to see other fixes for Baxi.