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Vaillant Bolier?

We have 3 years old Vaillant ecomax 824/2 E bolier. The problems is that water level keeps going down (below 1 bar) with fault code F25. If I refill the system again then reset, the bolier starts to work but I have to do this every 2-3 days. I couldn't find any leakage in my house. Please would you kindly let me know what the problem is.

Thank you.
Teresa

Teresa
February 2010
VaillantHeating, Home Heating SystemsProblems Water Bar
It's probably the pressure relief valve or expansion vessel ours did this at 4 yrs old. Never had a problem with it til then.

Charlie
November 2010
Sorry I meant the PRV. The usual cause of this is when the presure drops in the expansion vessel. This can be checked with a tyre presure guage. If this is less than 1 bar top it up using a pump

Daddy Pops
February 2010
Like the others have mentioned. It usually the APS. Its a common problem with vaillant 824 & 828

Daddy Pops
February 2010
We have had similar problems that were cured by replacing the pressure relief valve. Quick & simple, not very expensive.
Hope that helps

David
February 2010
have u looked outside to see if overflow pipe is leaking its the copper one

s maude
February 2010

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