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Mend Vokera Boiler Central Heating Leak

Boiler problem?

The pressure needle on My vokera boiler bounces when I turn on my hot water tap..I fill the cntral heating system up but the pressure drops dramatically overnight and reads nothing again in the morning.it also fires up every hour in the night for about 30 secs..yesterday water came out if the outlet (outside) pipe..any help appreciated thanks..
Lee

Lee
October 2015

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