What does error E.04.02 mean on a REMEHA Gas 220 Ace 300 Boiler?
- EElizabeth MonroeSep 2, 2025
If your REMEHA Boiler displays error code E.04.02, it indicates that the flow temperature sensor is open. This may be due to a bad connection, so check the wiring and connectors. If the wiring is intact, the sensor itself may be faulty and require replacement.