E5
Viessmann
Configuration / Model Mismatch Fault
Display shows E5, and the unit indicates a configuration mismatch.
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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 firmware for the model, wrong parameter set loaded, control board replaced with an incompatible version.
How to Fix / Troubleshooting
Safety first: This is a configuration issue; no hydraulic work is required.
- Verify model: Check the model number on the softener rating plate and compare it with the configuration shown in the installer menu.
- Reload parameters: If the controller allows, reload the default parameter set for your specific Viessmann softener model.
- Check replacement parts: If the control board was recently replaced, confirm that the correct part number was installed for this model.
- Firmware update: Contact Viessmann support to determine if a firmware update or reprogramming is required.
- Replace with correct board: If an incompatible board was installed, replace it with the proper Viessmann control board for this model.
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Repair Difficulty
Medium
3/5
Required Part
Viessmann Control Board (Model-Specific)
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