15
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Troubleshooting
Installer reference guide
70
2MXM-A9, 3MXM-A9, 4MXM-A9, 5MXM-A9
R32 Split series
4P600463-7G – 2022.09
15.3.2 Symptom: The unit is NOT heating or cooling as expected
Possible causes
Corrective action
Wrong connection of the electrical
wires.
Connect the electrical wires correctly.
Gas leakage.
Check for gas leakage.
Marks on the wiring and piping do NOT
match.
Marks on the wiring and piping (room A,
room B, room C, room D, room E) for
each indoor unit MUST match.
15.3.3 Symptom: Water leakage
Possible causes
Corrective action
Incomplete thermal insulation (gas and
liquid piping, indoor portions of the
drain hose extension).
Make sure the thermal insulation of the
piping and the drain hose is complete.
Improperly connected drainage.
Secure the drainage.
15.3.4 Symptom: Electrical leakage
Possible causes
Corrective action
The unit is NOT earthed correctly.
Check and correct the connection of the
earth wiring.
15.3.5 Symptom: Priority room setting does NOT function
Possible causes
Corrective action
The priority room setting may be set for
more than 1 room.
Only 1 room may be selected for the
priority room setting.
The Hybrid for Multi CANNOT be
selected as priority room.
Select another indoor unit for the
priority room setting.
A DHW generator for Multi CANNOT be
selected as priority room.
Please select an airconditioning unit as
priority room.
15.3.6 Symptom: Unit does NOT function or burn damage
Possible causes
Corrective action
The wiring was NOT performed in
accordance with the specifications.
Correct the wiring.
