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alpha cb 24?

my cb 24 heating works fine, hot water comes on for 8-10 seconds then goes off comes back on after 30 seconds and so on. before it goes off it sounds like an aeroplane landing. any ideas out there.
andy, July 2009
YOUR SECONDARY HEAT EXCHANGER (PLATE) WIL BE SCALED UP

STUBOW, July 2009
Your plate heat exchanger may be blocked, it'll prob need replaced.

Ian, July 2009