F.70
Vaillant
Parameter Set / Appliance Type Mismatch
F.70 error after PCB replacement or parameter change, boiler locked out
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect PCB fitted for boiler model, PCB not coded to correct gas type, Parameterization not completed after board replacement
How to Fix / Troubleshooting
Action:
- Contact a Vaillant-trained technician to check the PCB part number against the boiler model.
- The technician must enter the installer level menu and set the correct appliance type and gas family parameters.
- If the PCB is incompatible, it must be replaced with the correct Vaillant board.
This is not a user-correctable issue.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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