Daikin Multi+ R32 Split Series, Installer'S Reference Manual

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15 | Troubleshooting
Installer reference guide
67
4MWXM-A9
R32 Split series
4P708645-1 – 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, TO TANK ) 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.
A DHW tank 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.
15.4 Solving problems based on LED behaviour
15.4.1 Fault diagnosis using LED on outdoor unit PCB
DANGER: RISK OF ELECTROCUTION
▪
When the unit is NOT operating, the LEDs on the PCB are turned OFF in order to
save power.
▪
Even when the LEDs are OFF, the terminal block and the PCB may be powered.