Viessmann VITOCAL 300-G Installation And Service Instructions Manual page 156

Troubleshooting
Diagnosis (service scans)
How to analyse the information index
and fault index
1. Check the display value for each posi-
tion individually.
2. Determine active codes C from the
table.
3. See tables E and I for explana-
tions of active codes.
Information index "I" I
Position Code
Most recent commands transferred from the control unit to the EEV controller
1 4
2 1
2
4
3 0
4 0
Most recent status reported by the EEV controller to the control unit
5 1
2
4
8
6 1
2
4
8
7 0
8 1
Always specify the versions in case of questions
9 0 to F
10 0 to F
11 0 to F
12 0 to F
Example:
Information index "01 00 49 00 01 02"
156
(cont.)
Explanation
Message received regarding EEV controller restart
Enable refrigerant circuit control (EEV controller switches com-
pressor on automatically when required)
Enable vapour injection with EVI control circuit
Cooling mode enabled
N/A
N/A
Digital scroll relay enabled
EVI valve enabled
Refrigerant circuit control of heat pump control unit enabled via
digital input
Cooling mode enabled, start via digital input
Refrigerant circuit control of heat pump control unit enabled via
KM BUS
Vapour injection with EVI control circuit enabled via KM BUS
Cooling mode enabled, start via KM BUS
Compressor on
N/A
Compressor shutdown due to fault
EEV controller hardware version, position 1
EEV controller hardware version, position 2
EEV controller software version, position 1
EEV controller software version, position 2