Daikin H Series Technical Manual page 102

Troubleshooting
Phase Sequencer
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
connected 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.
LED
Description
Normal operation
Reverse phase
missing (local)
R (main power)
phase missing (local)
R phase missing
(export)
T phase missing
S phase missing
Reverse phase
Overheat
High pressure
Low pressure
Discharge sensor
missing
ON
Notes:
1. The relay will not cut off if sensor missing fault happened.
2. All errors can only be recovered by manual reset.
98
PW P_S P_T
(Red) (Yellow) (Yellow)
OFF
Actions
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.
Switch off the unit. Check the 3
phase wiring.
High discharge temperature. Check
the refrigerant system.
High discharge temperature. Check
the refrigerant system.
Low discharge temperature. Check
the refrigerant system.
Switch off the unit. Plug in sensor.
Fast Blink
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