Fault
code
Fault
Cause/Remedy
22
Min. compressor speed not
achieved
Restart; if problem persists, re-
place controller of the external
unit
23
System configuration changed
For information only (communi-
cation cables were modified)
24
Problem with system configura-
tion
Incorrect internal device con-
nected;
the total output of the internal de-
vices is greater than the max.
output of the external unit;
modify the configuration, if re-
quired
25
Overtemperature cut-out cool-
ing block (compressor is
switched OFF)
Air inlet blocked; check external
fan motor
26
Protection against icing-up
No fault; protection against icing-
up is active during defrosting
27
Overtemperature cut-out com-
pressor (compressor is
switched OFF)
Check whether there is insuffi-
cient refrigerant
28
System overload protection
(compressor is switched OFF)
No measure required; compres-
sor delay (approx. 2 h)
29
EEPROM faulty
Restart; replace controller, if EE-
PROM is required (operation with
specific parameters)
30
Not configured (controller can-
not be started)
Restart; if problem persists, re-
place controller
31
Poor transmission quality
Check the connecting cable be-
tween the internal device, the ex-
ternal unit and earth
Note
Procedure for testing the most impor-
tant components on page 28.
Diagnosis
(cont.)
24
Troubleshooting
5692
689
GB