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critical Drayton
Error Code E2
External sensor fault — indicates a problem with the external temperature sensor connection.
? What Causes This
Fault or failure of the external sensor connections. Check the connections at the terminal block.
✓ How to Fix It
- Verify that the external temperature sensor is properly connected.
- If no issues found, replace the Digistat+2 thermostat.
Source: page 2 of the official manual
From the manual
This error code appears in:
Drayton Digistat 2