Daikin F Series Technical Manual page 48

Troubleshooting
PHASE PROTECTOR
The unit with Scroll Compressor can only rotate in one direction. For this reason, a protective device (phase
sequential) is fitted to prevent incorrect wiring of the electrical phases. When the three phases are not
connected correctly, the phase sequential 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 sequential under normal operation and fault
conditions.
LED
Description
Normal Operation
Reverse Phase
T Phase Missing
S Phase Missing
R Phase Missing
Overheat
High Pressure
Low Pressure
Sensor missing
ON
OFF
46
PW P_S P_T
(Red) (Yellow) (Yellow)
Fast Blink
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.
High discharge pressure. Check the refrigerant system.
Low discharge pressure. Check the refrigerant system.
Switch off the unit. Plug in sensor.
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