Daikin UATN60CGXY1 Technical Manual page 54

Troubleshooting
Phase Protector
The unit with Scroll Compressor can only rotate in one direction. For this reason, a protective device (phase
protector) is fitted to prevent incorrect wiring of the electrical phases. When the three phases are not connect-
ed correctly, the phase protector operates, and the unit will not start.
This device is located in the control box of the outdoor unit.
The following table shows the LED indicator light for phase protector under normal operation and fault
conditions.
Model: UATN60/90C
LED
Description
Normal Operation
Reverse Phase
T Phase Missing
S Phase Missing
R Phase Missing
Overheat
Sensor missing
ON
OFF
Model: UATN120/150/180/210/240/300C
LED
Description
Normal operation
Reverse phase
T phase missing
S phase missing
R phase missing
S &T phase missing
+
Overload
+
Sensor missing
+
ON
Notes : 1. "+" indicates additional functions for PP01 phase protector.
2. When R phase missing, no LED or buzzer will indicate the error, but relay 71 and relay 81 will cut off.
50
PW P_S P_T
(Red) (Yellow) (Yellow)
Fast Blink
PW P_R P_S
(Red) (Yellow) (Yellow)
OFF
• Troubleshooting must be performed by qualified personnel.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
High discharge temperature. Check the refrigerant
system.
Switch off the unit. Plug in sensor.
P_T
(Yellow)
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
Switch off the unit. Check the 3 phase wiring.
High discharge temperature. Check the refrigerant system.
Switch off the unit. Plug in sensor.
Fast Blink
WARNING
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