Troubleshooting - Carrier 38GJQ Series Installation Instructions Manual

TROUBLESHOOTING

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 42 explains the error codes on both.
Sizes 18 and 24
MALFUNCTION NAME
Zero cross detection circuit malfunction (for indoor unit)
Malfunction protection of jumper cap (for indoor unit)
Feedback of without IDU motor(for indoor unit)
Indoor ambient temperature sensor is open/short circuited
Indoor evaporator temperature sensor is open/short circuited
Liquid valve temperature sensor is open/short circuited
Gas valve temperature sensor is open/short circuited
Modular temperature sensor is open/short circuited
Outdoor ambient temperature sensor is open/short circuited
Outdoor condenser middle pipe temperature sensor is
open/short circuited
Outdoor discharge temperature sensor is open/short circuited
Communication malfunction
Malfunction of phase current detection circuit for compressor
Module high temperature protection
Refrigerant lacking or blockage protection of system (not
available for residential ODU)
Charging malfunction of capacitor
High pressure protection of system
Low pressure protection of system (reserved)
Compressor overload protection
Indoor unit and outdoor unit do not match
Malfunction of memory chip
Wrong connection of communication wire or malfunction of
electronic expansion valve
Malfunction protection of outdoor fan 1
Detection status of wrong connection of communication wire or
malfunction of electronic expansion valve
Mode conflict
Refrigerant recycling mode
X-fan
Defrosting or oil return in heating mode
Start failure of compressor
High discharge temperature protection of compressor
Overload protection
Whole unit over-current protection
Compressor phase current protection
Compressor de-synchronizing
Compressor phase-lacking/phase-inverse protection
IPM modular protection
DC bus-bar low voltage protection
DC bus-bar high voltage protection
PFC protection
The four-way valve is abnormal
Table 42—Malfunction Status Table
Viewing malfunction code through remote controller within 200s;
displayed directly on nixie tube after 200s
Viewing malfunction code through remote controller within 200s;
displayed directly on nixie tube after 200s
Viewing malfunction code through remote controller within 200s;
displayed directly on nixie tube after 200s
45
MALFUNCTION TYPE
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Hardware malfunction
Operation status
Operation status
Operation status
Operation status
Operation status
NIXIE
TUBE
U8
C5
H6
F1
F2
b5
b7
P7
F3
F4
F5
E6
U1
P8
F0
PU
E 1
E3
H3
LP
E E
dn
L3
dd
E7
Fo
AL
H 1
Lc
E4
E8
E5
P5
H7
Ld
H5
PL
PH
HC
U7