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error Della
Error Code E1
Indoor room temperature sensor fault — malfunction in sensing indoor temperature.
? What Causes This
Sensor cable disconnected, damaged sensor cable or contact points, damaged internal PCB.
✓ How to Fix It
Contact professional service to repair the faulty component.
Source: page 40 of the official manual
From the manual
This error code appears in:
Della 048 MS T1159k