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Hello all, my Vaillant ecoFit Pure 825- 835 combi boiler has been running fine from 2019 till early 2024. We have had a mains water pipe leak due to which it had been off for a few months.
The leak was fixed and we switched the boiler on but now its pressure constantly drops. It is still under warranty and the engineer checked it out. Said no leak and replaced vessel, replaced LWPS?, AAV, PRV.
And 3 parts fitted.
It showed error F75 and then F22
Dropped from 2.1 to 0.3 overnight. It does come back on if I repressurise and works till the heating is on. Soon after it is switched off it loses pressure gradually.
What could possibly be the problem? Could the pressure switch be defective?
The radiators were bled recently during the annual service. Could this contribute to the problem?
The leak was fixed and we switched the boiler on but now its pressure constantly drops. It is still under warranty and the engineer checked it out. Said no leak and replaced vessel, replaced LWPS?, AAV, PRV.
And 3 parts fitted.
It showed error F75 and then F22
Dropped from 2.1 to 0.3 overnight. It does come back on if I repressurise and works till the heating is on. Soon after it is switched off it loses pressure gradually.
What could possibly be the problem? Could the pressure switch be defective?
The radiators were bled recently during the annual service. Could this contribute to the problem?