Phase Sequential (3ph)
LED
Description
PW
(Red)
P_S
(Yellow)
P_T
(Yellow)
Actions
Normal operation
-
Reverse phase
Switch off the unit. Check the 3 phase wiring
T phase missing
Switch off the unit. Check the 3 phase wiring
S phase missing
Switch off the unit. Check the 3 phase wiring
R phase missing
Switch off the unit. Check the 3 phase wiring
R (main power)
phase missing
Switch off the unit. Check the 3 phase wiring
Overheat
High discharge temperature. Check the refrigerant system.
High Pressure
High discharge temperature. Check the refrigerant system.
Low Pressure
Low discharge temperature. Check the refrigerant system.
Sensor missing
Switch off the unit. Plug in sensor.
ON OFF Fast Blink
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.
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