E18
Dettson
Sensor Configuration / Parameter Fault
Boiler shows E18 and indicates sensor mismatch or configuration error
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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 sensor type selected in control menu, Missing Dettson sensor, Wiring to unused sensor terminals, Firmware incompatibility
How to Fix / Troubleshooting
Safety: Only qualified personnel should change advanced parameters. Turn off power before wiring changes.
- Review installation manual: Confirm which sensors are required for your specific Dettson boiler model and system configuration.
- Check connected sensors: Ensure that only the appropriate sensors (supply, return, DHW, outdoor, flue) are wired to the control and that no extra wires are shorting unused terminals.
- Verify control settings: In the installer menu, confirm sensor types and system configuration match the installed hardware.
- Firmware update: If the boiler was recently serviced or a board replaced, a technician may need to update or match firmware to the boiler model.
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Repair Difficulty
Hard
4/5
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