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Mend Vaillant 837E Combi Boiler Repair Water Pressure

How can I fix Vaillant Turbomax Plus 837E Combi?

With both filling taps firmly shut,the water pressure goes up from 1.2 to 1.4 over 24 hours and 1.6 for 48
hours etc and then overflows eventually.
What can be wrong ? Are the two taps faulty ?
Can a filling loop be installed instead ?

Frank S
June 2010
VaillantVaillant 837EHeating, Home Heating SystemsCombi Boiler Boiler Repair Water Pressure

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