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How can I stop my vaillant Ecomax 824 /2E from exhausting all it's pressure?

My ecomax 824 keeps making a loud buzzin/humming noise an exhausts the pressure from the boiler even if the heating is off.
An no matter how many times I top the pressure up it keeps exhausting the pressure every few hours!!!!
HELP!!

Boris Edwards
January 2010
VaillantHeating, Home Heating SystemsVaillant Making Noise
I am a domestic plumber by rights an it's not so much of a case of me wanting to toy with the insides of the boiler. I don't need lectures on what I'm legally allowed to repair by regs, I need help identifying the problem incase it's something simple that doesn't require me to call a boiler technician!!

Bozza
January 2010
Call a QUALIFIED GAS SAFE PLUMBER- DONT MESS ABOUT WITH WHAT YOU DONT KNOW ABOUT!! iT CAN BE SERIOUSLY DANGEROUS AND AN OFFENCE UNDER THE GAS SAFETY AND INSTALLATION ACT 1984 TO PERFORM ACTS ON A BOILER FOR WHICH YOUR NOT QUALIFIED

GEEEZ, AND THEY CALL SOME OF US COWBOYS!!

GAS SAFE PLUMBER
January 2010

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