expansion vessel for combinaton boiler

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15 Jan 2009
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Belfast
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United Kingdom
should the expansion vessel be filling with water, if not would this cause heating not to start? Would a new expansion vessel fix this problem?
 
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Very possibly. The ch pressure will rise and be released through the pressure relief valve causing a low pressure situation when it cools down either failing to make the low water pressure switch or overheating and locking out.
 

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