40MAHB: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
14
INDOOR UNIT DIAGNOSTIC GUIDES
For ease of service, the systems are equipped with diagnostic code display LEDs on the indoor unit. There may be a few error codes displayed in the
indoor unit that might relate to the outdoor unit's problems. If possible, always check the diagnostic codes displayed on the indoor unit first.
Table 4 — Indoor Unit Diagnostic Guides
☆
= Flashing, X = Off
Table 5 — Indoor Unit Diagnostic Guides
O (on
−
light) X (off
−
light)
☆(
flash)
GREEN LED
RED LED
FAILURE MODE
On
X
Standby, normal
X
On
Operation, normal
On
On
High/Low voltage protection on compressor terminal
On
☆
EEPROM error
X
☆
The compressor speed is out of control
☆
On
Zero-crossing signal detection error; lack of phase; synchronization error
☆
X
IGBT or Module protection
☆
☆
Communication error
OPERATION LAMP (TIMES)
TIMER LAMP
DISPLAY
ERROR INFORMATION
☆
1
OFF
EH 00/EH 0A
Indoor unit EEPROM parameter error
☆
2
OFF
EL 01
Indoor/outdoor unit communication error
☆
3
OFF
EH 02
Zero-crossing signal detection error
☆
4
OFF
EH 03
Indoor fan operating outside of the normal range
☆
5
OFF
EC 51
Outdoor unit EEPROM parameter error
☆
5
OFF
EC 52
T3 is in open circuit or has short circuited
☆
5
OFF
EC 53
T4 is in open circuit or has short circuited
☆
5
OFF
EC 54
TP is in open circuit or has short circuited
☆
5
OFF
EC 56
T2B is in open circuit or has short circuited
☆
6
OFF
EH 60
T1 is in open circuit or has short circuited
☆
6
OFF
EH 61
T2 is in open circuit or has short circuited
☆
12
OFF
EC 07
Outdoor fan operating outside of the normal range
☆
9
OFF
EH 0b
Indoor PCB/Display board communication error
☆
8
OFF
EL 0C
Refrigerant leakage detection
☆
7
FLASH
PC 00
IPM malfunction or IGBT OSCP
☆
2
FLASH
PC 01
Over voltage or over low voltage protection
☆
3
FLASH
PC 02
Compressor or IPM high temp/pressure protection
☆
5
FLASH
PC 04
Inverter compressor drive error
☆
1
FLASH
PC 08
Current overload protection
☆
6
FLASH
PC 40
Comm. error between outdoor chip and compressor chip
☆
7
FLASH
PC 03
Low pressure protection
☆
1
ON
--
Indoor units mode conflict
☆
9
OFF
EH b1
Indoor board and Multi-function communication error
☆
11
OFF
FH 0d
Ionizer malfunction