Indoor Unit Diagnostic Guides - Carrier 40MAHB Series Service Manual

40MAHB: Service Manual

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.
GREEN LED
On
X
On
On
X
☆
☆
☆
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
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 4 — Indoor Unit Diagnostic Guides
RED LED
X Standby, normal
On Operation, normal
On High/Low voltage protection on compressor terminal
EEPROM error
☆
☆ 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
☆ = Flashing, X = Off
Table 5 — Indoor Unit Diagnostic Guides
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)
FAILURE MODE
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
Comm. error between outdoor chip and compressor chip
Low pressure protection
Indoor units mode conflict
Indoor board and Multi-function communication error
Ionizer malfunction
14