4. Diagnostic code
Flash times of
LED on
mainboard
Trouble description Analyze and diagnose
1 Eeprom failure Outdoor main board eeprom fail
2 IPM failure IPM failure
4
Communication error between main
board and spdu module SPDU
Communicition error
Communication fail over 4 min
5 High pressure protection System high pressure over 4.15 Mpa
6
Module over-voltage protection(only for
Spdu)
Module lack-voltage protection(only for
Spdu)
Send from Spdu module
8
Compressor discharging temperature
protection
Compressor discharging temperature over 110
centigrade
9 Abnomal of DC motor jam of DC motor or motor failure
10 Abnomal of pipe sensor Piping sensor short-circuit or open-circuit
12 Abnomal of outdoor ambient senso Outdoor ambient sensor
short-circuit or open-circuit
13
Abnormal of compressor dischage
sensor
Compressor discharging sensor short-circuit or
open-circuit
15
Communication error between indoor
and outdoor unit
Communication fail over 4 min
16 Lack of refrigerant check if there is leakage in the unit
17 4-way valve reverse failure
Alarm and stop if detect Td-Tci<=15 last for 1min
after compressor has started for 10min in heating
mode, confirm the failure if it appears 3 times in
one hour.
18 Compressor jam (ony for spdu ) Inner compressor is abnormal jamed
19 Module EEV select circuit error Module EEV select wrong circuit
25 Compressor U-phase over-current The current of compressor U-phase is too high
25 Compressor V-phase over-current The current of compressor V-phase is too high
25 Compressor W-phase over-current The current of compressor W-phase is too high
45 Low pressure protection System over pressure under 0.05Mpa
YHUJYH024BARXA-X
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