baxi 105e pressure problem

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28 Apr 2008
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United Kingdom
hi, i've got a baxi 105 e boiler which the pressure keeps rising on and blowing off on press. relief valve anybody got any ideas whats wrong?
 
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If it rises without being on, the secondary heat exchanger is letting mains water get into the CH water.
 
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HI

it is common fault on these boilers Domestic Hot Water heat exchanger
leaking internally.(if the filling loop is o.k)
 

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