Code
Description
Causes and corrective actions
Error on the main controller
Main controller damaged: replace the main controller.
Frost protection running
Domestic hot water tank installed in a room exposed
to frost: install the domestic hot water tank in a frost-
free room.
4-way valve blocked in cold mode: unblock or re
place the 4-way valve.
11.4 Clearing the error codes
If the probable cause of an error code is resolved, but the error code is still
displayed:
1. Clear the error code or codes by pressing keys and together for
3 seconds.
2. Repeat the operation until the code or codes disappear.
11.5 Diagnosing errors on the outdoor unit
Only qualified persons may carry out diagnostics of the outdoor unit as the
process is carried out directly on the outdoor unit.
1. Switch the thermodynamic water heater off.
2. Remove the top cover from the outdoor unit.
3. Switch the thermodynamic water heater back on.
Danger
Electrified bare parts are then accessible.
4. Scroll through the error codes by pressing the QUERY button.
5. Refer to the list of error codes for the outdoor unit.
6. Once troubleshooting is complete, put the top cover back on the
outdoor unit.
For more information, see
List of error codes for the outdoor unit, page 54
11.6 List of error codes for the outdoor unit
Tab.25 Outdoor unit error codes
Code no.
Code description
Complement
0
Normal display
Water temperature T5L
dF : Defrosting phase
dC : Refrigerant fluid recovery mode
0: Holiday mode
1
Mode
2: In residence
8: Holiday
2
Fan speed
F0: Shut-down
F1: Low speed
F2: High speed
3
Evaporation temperature value
T3
4
Air temperature value
T4
5
Water temperature value
T5L
6
Suction temperature value
Th
7
Discharge temperature value
Tp
Fig.56
MW-4000189-2
2
4
11 Troubleshooting
54
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