System bus Part 4: Installation and Start-up
70
Error messages
If a fault or error occurs in the heating system, you will see
a blinking warning triangle (E) and the related error num-
ber on the controller display. Please refer to the table be-
low for the significance of the displayed error code.
The system must be restarted after a fault has been reme-
died => RESET.
RESET : Brief device shut-off (mains switch). Controller
restarts, reconfigures itself and continues to operate with
the values that have already been set.
RESET+ Ä : Overwrite all settings with default val-
ues (except language, time and sensor values).
The additional button (Ä) must be pressed when the con-
troller is switched on (mains on) until "EEPROM" appears
in the display.
Error no. Error description
Communication error
E 90 ID 0 and 1 on bus. Bus IDs 0 and 1 may not be
used simultaneously.
E 91 Bus ID used. The set bus ID is already in use by
another device.
More than 1 Time Master in the system
Internal error
E 81 EEPROM error. The invalid value has been re-
placed with the default value E Check parame-
ter values!
Sensor error (break/short)
E 69 Flow sensor HC2
E 70 Flow sensor HC1
E 75 Outdoor sensor
E 76 Storage tank sensor
E 77 Boiler sensor
E 79 Sensor multifunction relay 1
E 80 Room sensor HC1 / Storage tank sensor flow
HC1
E 83 Room sensor HC2 / Pool sensor / Storage tank
sensor flow HC2
E 131 Storage tank sensor lower HC1
E 134 Multifunction relay BUFFER Lower (Solar / Solid
fuel) / Storage tank sensor lower HC2
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