Hi All
Help please!
I have a Vaillant 824E Turbomax.
When it is running in 'constant' with heating and hot water on it is fine - pressure 1 to 1.5 bar.
If I switch heating off it gradually loses pressure for about 4 hours then locks out with code F.28 (note not F.22).
If I recharge to about .5 bar and turn heating back on (water no problem) it rapidly gains pressure back to normal.
If I turn heating off then wait until pressure down to about .5 bar, then turn heating back on it gains pressure again back to normal.
Installer and Vaillant engineer have visited and replaced expansion vessel and pressure release valve but problem still remains!
Any ideas please???
Help please!
I have a Vaillant 824E Turbomax.
When it is running in 'constant' with heating and hot water on it is fine - pressure 1 to 1.5 bar.
If I switch heating off it gradually loses pressure for about 4 hours then locks out with code F.28 (note not F.22).
If I recharge to about .5 bar and turn heating back on (water no problem) it rapidly gains pressure back to normal.
If I turn heating off then wait until pressure down to about .5 bar, then turn heating back on it gains pressure again back to normal.
Installer and Vaillant engineer have visited and replaced expansion vessel and pressure release valve but problem still remains!
Any ideas please???