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4 month old Vaillant ecotec plus 831 falling pressure?

new boiler worked for 6 weeks after installation in Oct 2008 and then has consistently suffered from falling pressure-discovered installer had installed extra expansion vessel on previous boiler but they refused to remove from new one . Asked experienced trusty plumber(has done many jobs for me) who disconnected it and it settled for 6 days and then lost pressure again-F22.Any ideas? getting desperate! Diane

Diane
February 2009
VaillantVaillant ecotec plus 831Heating, Home Heating SystemsVaillant Ecotec 831 Boiler
there must be a leak someware. try isolate valves bottom of boiler and than check if hold and its a system loosing pressure of if still pressure loss than it may be boiler loosing to condesate drain check and keep posted

Mr K
February 2009

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Vaillant Ecotec 831 Losing Pressure - Help!