No.
Fault code
Fault
Cause/Remedy
5
4
3
2
1
20
●
∘
●
∘
∘
Overtemperature cut-
out of the heat exchan-
ger of the internal de-
vice
21
●
∘
●
∘
●
Overrun protection
...
(N/A)
24
●
●
∘
∘
∘
EEPROM not updated
Unit operates with ROM
parameters; no change of
the unit settings (fan, tem-
perature etc.) possible.
Replace the controller of the
internal device.
25
●
●
∘
∘
●
EEPROM faulty
26
●
●
∘
●
∘
Poor communication
Check the electrical con-
necting cable between the
internal device, the external
unit and earth
27
●
●
∘
●
●
Utilisation of EEPROM
data
No fault
28
●
●
●
∘
∘
Model A
29
●
●
●
∘
●
Model B
30
●
●
●
●
∘
Model C
31
●
●
●
●
●
Model D
●
Cooling and heating LEDs illumi-
nate together
∘
Only the heating LED illuminates
Diagnosis at the external unit, type OD306H
The MSMP controller is equipped with 9 LEDs (1 standby LED, 3 equipment
LEDs and 5 fault LEDs).
Diagnosis
(cont.)
18
Troubleshooting
5692
689
GB