DE DIETRICH Thermostat modulant d’ambiance - Manual (Page 69)

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F214: Incorrect room temperature reading
Fault indication Fault code F214
c is lite up
Display text Room temperature is out of measuring range or sensor is defective.
Solution Room temperature reading is incorrect. If the room temperatureis
between -5ºC and 65ºC, the temperature sensor may be faulty.
Contact your installer.
F215: Thermostat failure
Fault indication Fault code F215
c is lite up
Display text Internal fault. Thermostat failure.
Solution Contact your installer.