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Brittany TaylorAug 29, 2025
What to do if VAT Control Unit display shows «E 22» error?
- FFrederick PhillipsAug 29, 2025
To fix the 'E 22' error on your VAT Control Unit, indicating the rotation angle of the valve plate is limited during operation, start by cleaning the valve unit thoroughly according to the maintenance procedure. Then, resolve any mechanical obstructions that may be present. Finally, reset the control unit by cycling the power off and on, or by sending a reset command locally via the service port with CV/CPA/Service Box2. The error might be caused by a heavily contaminated valve unit or a mechanical obstruction of the valve plate.