Viessmann Vitoclima 300-S Service Instructions For Contractors page 22

Troubleshooting
Diagnosis
(cont.)
A Three-digit display
B Key "Back"
C Key "Select"
D Key "Continue"
E Key "Exit"
Note
Only one fault code will be displayed, even if several faults have occurred.
To display further fault codes:
Switch the unit OFF and isolate it from the power supply.
Remove the fault.
Call up the diagnostic function again.
Fault codes external unit, type OT307H
Fault Fault
code
01 Temperature sensor at the heat
exchanger of the external unit
02 Compressor temperature sen-
sor
03 Processor temperature sensor
04 Outside temperature sensor
05 Wet steam temperature sensor
06 Suction gas temperature sensor
22
Select the required parameter with
B/D.
Acknowledge the selection with C.
Call up the highest level with E.
Select diagnosis (dIA).
Select external unit/internal device:
oXX Fault code external unit
AXX Fault code internal device A
bXX Fault code internal device B
CXX Fault code internal device C
dXX Fault code internal device D
XX represents the fault code.
Cause/Remedy
Check sensor connection;
replace sensor