Viessmann Vitoclima 300-S Service Instructions For Contractors page 17

Diagnosis
(cont.)
Fault codes of the internal device
No. Fault code
5 4 3 2
01
02
03
04
05
06
07
08
09
10
11
...
17
18
19
Fault
1
Room temperature
sensor not connected
Room temperature
sensor short circuit
Temperature sensor of
the heat exchanger of
the internal device not
connected
Short circuit of the
temperature sensor of
the heat exchanger of
the internal device
Suction gas tempera-
ture sensor not con-
nected
(N/A)
Communication error
No communication
No coding
(N/A)
External unit fault
(N/A)
Protection against
icing-up
Defrost protection
External unit protec-
tion
Troubleshooting
Cause/Remedy
Check sensor connection;
replace sensor
Incompatible controllers of
the internal device and the
external unit: Replace the
controller of the internal de-
vice
Check the connecting cable
between the internal device,
the external unit and earth
Check fan motor connection;
replace fan motor;
Replace the controller of the
internal device
Change over to diagnosis of
external unit
17