Troubleshooting - Carrier 40MAHB Series Installation Instructions Manual

TROUBLESHOOTING

For ease of service, the systems are equipped with diagnostic code display LEDs on both the indoor and outdoor units. The indoor
diagnostic display is a combination of flashing LEDs on the display panel or the front of the unit.
Some indoor units display error codes specifying failure modes in the outdoor units. If possible, always check the diagnostic codes displayed on
the indoor unit first.
The diagnostic codes displayed in the indoor and outdoor units are listed in Table 9.
INDOOR UNIT DIAGNOSTIC GUIDES
OPERATION LAMP (TIMES)
☆
1
☆ 2
☆
3
☆
4
☆
5
☆
5
☆ 5
☆
5
☆
5
☆
6
☆
6
☆ 12
☆
9
☆
8
☆
7
☆
2
☆ 3
☆
5
☆
1
☆
6
☆
7
☆ 1
☆
9
☆
11
For additional diagnostic information, refer to the service manual.
40MAHB-01SI
Table 9 —
Indoor Unit Diagnostic Codes
TIMER LAMP DISPLAY
OFF EH 00/EH 0A
OFF EL 01
OFF EH 02
OFF EH 03
OFF EC 51
OFF EC 52
OFF EC 53
OFF EC 54
OFF EC 56
OFF EH 60
OFF EH 61
OFF EC 07
OFF EH 0b
OFF EL 0C
FLASH PC 00
FLASH PC 01
FLASH PC 02
FLASH PC 04
FLASH PC 08
FLASH PC 40
FLASH PC 03
ON --
OFF EH b1
OFF FH 0d
O (on − light) X (off − light) ☆(flash)
Specifications subject to change without notice.
ERROR INFORMATION
Indoor unit EEPROM parameter error
Indoor/outdoor unit communication error
Zero-crossing signal detection error
Indoor fan operating outside of the normal range
Outdoor unit EEPROM parameter error
T3 is in open circuit or has short circuited
T4 is in open circuit or has short circuited
TP is in open circuit or has short circuited
T2B is in open circuit or has short circuited
T1 is in open circuit or has short circuited
T2 is in open circuit or has short circuited
Outdoor fan operating outside of the normal range
Indoor PCB/Display board communication error
Refrigerant leakage detection
IPM malfunction or IGBT OSCP
Over voltage or over low voltage protection
Compressor or IPM high temp/pressure protection
Inverter compressor drive error
Current overload protection
Communication error between outdoor chip and compressor chip
Low pressure protection
Indoor unit mode conflict
Indoor board and Multi-function communication error
Ionizer malfunction
19