Symptom: The Unit Is Not Heating Or Cooling As Expected; Symptom: Water Leakage; Symptom: Electrical Leakage; Symptom: Priority Room Setting Does Not Function - Daikin 3MXM40A2V1B9 Installer's Reference Manual

15 | Troubleshooting

15.3.2 Symptom: The unit is NOT heating or cooling as expected

15.3.3 Symptom: Water leakage

15.3.4 Symptom: Electrical leakage

15.3.5 Symptom: Priority room setting does NOT function

15.3.6 Symptom: Unit does NOT function or burn damage

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