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Mend Worcester Bosch Highflow 400 Central Heating Pressure

any ideas what the fault is?

I have a Worcester Bosch Highflow 400 boiler. The hot water works fine, the problem is the central heating. The pressure gauge keeps rising. I have changed the fill pipe from the mains, no leakage from mains side. When changing pipe, I noticed air bubbles coming from the central heating side. Any ideas, I have plummber coming in Friday. Many thanks for any advice.

Paul C.
October 2008
Worcester BoschWorcester Bosch Highflow 400Heating, Home Heating SystemsCentral Heating Worcester Bosch Pressure
your water to water heat exchange is more than likely got a small hole in it
thus it lets mains water into your system try eazy parts or let your plumber do it lol

Chris
November 2008

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Worcester Bosch Highflow 400: Rising Pressure - Help!