Troubleshooting 1/2 - AEG FRTD 903 TC Benutzerhandbuch

Troubleshooting 1/2

Page 59
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Error messages:
If a fault or error occurs, the thermostat will display one of the following error
messages:
E0: Internal failure . The thermostat is defective . Contact your heating engineer .
The thermostat must be replaced .
E1: Internal sensor defective or short-circuited . Contact your heating engineer .
The thermostat must be replaced .
E2: External wired floor sensor disconnected, defective or short-circuited .
Contact your heating engineer for reconnection or replacement .
E5: Internal overheating . Contact your heating engineer in order to have the
installation inspected .
• Three circles containing dots are displayed on the screen; the thermostat cannot
be operated .
The thermostat is in "Child Lock" mode . See the section titled "Child Lock" in this
manual for instructions on how to unlock it .