10 Faults and malfunctions
59
FA ROTEX ESU - 07/2008
10.3 Fault codes
Tab. 10-1 Error codes of the ROTEX ESU on the ROTEX ALPHA
+
23R
Fault code
Designation
Type of fault
Comments
00-X
(X = 0 ... 9)
Internal fault
Interruption
The processor has detected an undefined condition. An
entry is added to the fault register. The system shuts down.
10-0
External temperature sensor
Interruption
The system resumes operation with a fixed external
temperature of 0 °C.
10-1
External temperature sensor
Short circuit
The system resumes operation with a fixed external
temperature of 0 °C.
11-0
Flow temperature sensor
Interruption
11-1
Flow temperature sensor
Short circuit
12-0
Mixer circuit flow sensor
Interruption
ROTEX ESU switches the mixer circuit pump and the
mixer motor power off
12-1
Mixer circuit flow sensor
Short circuit
ROTEX ESU switches the mixer circuit pump and the
mixer motor power off
13-0
Hot water (storage tank) sensor
Interruption
13-1
Hot water (storage tank) sensor
Short circuit
16-0
set to incorrect device type (oil)
No switch-on
Change by parameter 1.
17-0
Return flow temperature sensor
Interruption
17-1
Return flow temperature sensor
Short circuit
30-2
Heat generator
No switch-off
30-3
Heat generator
No switch-on
70-6
set to incorrect device type (gas)
No switch-on
Change by parameter 1.
99-9
Undervoltage
Interruption
The mains voltage falls below 190 V for at least 1 s.
The processor backs up all data and enters hibernation
mode. All relay contacts are released. If the mains voltage
rises above 195 V again for at least 5 s, this triggers a
restart.
uuuu
Sensor interruption
nnnn
Sensor short circuit
