DE DIETRICH Thermostat modulant d’ambiance - Manual (Page 68)

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7.1 Fault messages
F200: No connection to outside sensor
F203: Faulty connection to boiler
Fault indication Fault code F200
c and Z are lit up.
Display text No connection to outside sensor.
Solution Check the boiler's connection to the outside temperature sensor.
Fault indication Fault code F203
c is lite up
Display text Communication fault. Check the connection.
Solution Check the connection to the boiler.