E1 is displayed if the radiator actuator is not mounted or is mounted incorrectly.
Make sure that you select the appropriate adapter and push it on far enough until it clicks into place.
Example: Danfoss RA
One of the supplied black plastic adapters is used for this purpose (see photo YELLOW).
Please pay attention to this when mounting:
- Bend the black adapter far enough apart and push it all the way through to the stop of the metal valve (click into place).
- Fold together and fasten with screw.
- Screw on the HSA.
You can see the correct adapter + screw in the attachment:
If you use the larger RAV adapter, the small black pin may need to be placed on the valve to compensate for the length.