48
TROUBLESHOOTING (CONT)
This unit has on−board diagnostics. Error codes are displayed on the wired remote controller and the outdoor unit microprocessor board with
colored LED lights. Table 45 explains the error codes on both.
Sizes 48 − 56
Table 45—Malfunction Status Table
ERRORS OF DEFINITION
MAIN CONTROL DISPLAY FOR OUTDOOR UNIT
INDOOR UNIT
CODE
TESTING
BOARD
CODE
YELLOW LED RED LED GREEN LED
Indoor unit 3 is connected Flash 7 times
Indoor unit 4 is connected Flash 8 times
Indoor unit 5 is connected Flash 9 times
Indoor unit 6 is connected Flash 10 times
Indoor unit 7 is connected Flash 11 times
Indoor unit 8 is connected Flash 12 times
Indoor unit 9 is connected Flash 13 times
Indoor anti-freeze protection E2 E2
Inside temperature sensor error F1 F1
Evaporator midway temp sensor error F2 F2
Liquid pipe of BU module temperature sensor error b5 b5
Gas pipe of BU module temperature sensor error b7 b7
Mode conflicts E7 E7
Communication error BU 1 Indoor unit A
Indoor unit B
Indoor unit C
BU 2 Indoor unit A
Indoor unit B
Indoor unit C
BU 3 Indoor unit A
Indoor unit B
Indoor unit C
Communication error between the main board and
driving board
P6
Communication error between the main board and
testing board
CE
Indoor unit gas sensor error Fn
Indoor unit humidity sensor error L1
Indoor unit water full protection E9
Jumper terminal error C5 C5
Power supply phase lack dJ
Outdoor unit fan motor error L3
Refrigerant recovery mode Fo Fo
Branch Box
ERRORS
INDICATING LED FLASHING TIMES
INDOOR UNIT
ERROR CODE
OUTDOOR UNIT
ERROR CODE
YELLOW LED GREEN LED RED LED
BU 1 is connected Flash 1 time
BU 2 is connected Flash 2 times
BU 3 is connected Flash 3 times
Indoor unit A is connected Flash 1 time
Indoor unit B is connected Flash 2 times
Indoor unit C is connected Flash 3 times
Indoor unit A gas tube temperature sensor error Flash 1 time b7 b7+ indoor unit address
Indoor unit A liquid tube temperature sensor error Flash 2 times b5 b5+ indoor unit address
Indoor unit B gas tube temperature sensor error Flash 3 times b7 b7+ indoor unit address
Indoor unit B liquid tube temperature sensor error Flash 4 times b5 b5+ indoor unit address
Indoor unit C gas tube temperature sensor error Flash 5 times b7 b7+ indoor unit address
Indoor unit C liquid tube temperature sensor error Flash 6 times b5 b5+ indoor unit address
Copyright 2017 Carrier Corp. D 7310 W. Morris St. D Indianapolis, IN 46231 . Edition Date: 06/17
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Catalog No:38GJQ-02SI
Replaces: IM-38GJQ-01
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