Daikin REYQ-AATJA, Service Manual, Page: 295 / 495

SiUS372201EA Troubleshooting by Error Code
Part 6 Service Diagnosis 288

Depending on operating condition, partial refrigerant shortage may be detected even though
correct refrigerant amount is in the system. Please refer to Refrigerant Shortage Check on page
432 for the analysis.
16I-## _ _ 1 6 0 9 - # # —
Heat exchanger liquid pipe thermistor
1 failure prediction (Tf1)
■ Tf1 sensor failure Refer to J8 troubleshooting.
16J-## _ _ 1 6 1 0 - # # —
Heat exchanger liquid pipe thermistor
2 failure prediction (Tf2)
■ Tf2 sensor failure Refer to J8 troubleshooting.
16L-## _ _ 1 6 1 2 - # # —
Compressor suction thermistor failure
prediction (Ts)
■ Ts sensor failure Refer to J5 troubleshooting.
16M-## _ _ 1 6 1 3 - # # —
Accumulator inlet thermistor failure
prediction (TsA)
■ TsA sensor failure Refer to J5 troubleshooting.
16N-## _ _ 1 6 1 4 - # # —
Receiver gas purge thermistor failure
prediction (Tgi)
■ Tgi sensor failure Refer to J9 troubleshooting.
16O-## _ _ 1 6 1 5 - # # —
Liquid pipe thermistor failure
prediction (TL)
■ TL sensor failure Refer to J7 troubleshooting.
16P-## _ _ 1 6 1 6 - # # —
Heat exchanger gas pipe thermistor 1
failure prediction (Tg1)
■ Tg1 sensor failure Refer to J6 troubleshooting.
16Q-## _ _ 1 6 1 7 - # # —
Heat exchanger gas pipe thermistor 2
failure prediction (Tg2)
■ Tg2 sensor failure Refer to J6 troubleshooting.
16S-## _ _ 1 6 1 9 - # # —
Subcooling injection thermistor failure
prediction (Tm)
■ Tm sensor failure Refer to J7 troubleshooting.
16U-## _ _ 1 6 2 1 - # # —
Electrical box air outlet thermistor
failure prediction (Tjeva)
■ Tjeva sensor failure Refer to J9 troubleshooting.
16V-## _ _ 1 6 2 2 - # # —
High pressure sensor failure
prediction (HP)
■ HP sensor failure Refer to JA troubleshooting.
16W-## _ _ 1 6 2 3 - # # —
Low pressure sensor failure
prediction (LP)
■ LP sensor failure Refer to JC troubleshooting.
20A-## _ _ 2 0 0 1 - # # —
Heat exchanger freeze up prediction ■ Tb sensor failure
■ Freeze
Melt frost on the outdoor heat exchanger.
30A-## _ _ 3 0 0 1 # # # _ _ #
Indoor unit electronic expansion valve
leak (evaporator) prediction
■ Tb sensor failure
■ Indoor leakage
Th1: Refer to C9 troubleshooting.
Th2: Refer to C4 troubleshooting.
Th3: Refer to C5 troubleshooting.
LP: Refer to JC troubleshooting.
If the above error is not seen, the corresponding
indoor electronic expansion valve and expansion
valve coil can be considered.
31A-## _ _ 3 1 0 1 # # # _ _ #
Indoor unit thermistor failure
prediction (Th1)
■ Th1 sensor failure
■ Th2 sensor failure
■ Th3 sensor failure
Th1: Refer to C9 troubleshooting.
Th2: Refer to C4 troubleshooting.
Th3: Refer to C5 troubleshooting.
31B-## _ _ 3 1 0 2 # # # _ _ #
Indoor unit thermistor failure
prediction (Th2)
■ Th1 sensor failure
■ Th2 sensor failure
■ Th3 sensor failure
Th1: Refer to C9 troubleshooting.
Th2: Refer to C4 troubleshooting.
Th3: Refer to C5 troubleshooting.
31C-## _ _ 3 1 0 3 # # # _ _ #
Indoor unit thermistor failure
prediction (Th3)
■ Th1 sensor failure
■ Th2 sensor failure
■ Th3 sensor failure
Th1: Refer to C9 troubleshooting.
Th2: Refer to C4 troubleshooting.
Th3: Refer to C5 troubleshooting.
43A-## _ _ 4 3 0 1 - 0 0 —
Refrigerant shortage and refrigerant
leakage prediction (detected during
non-operation)
■ HP sensor failure
■ Refrigerant leak or shortage
HP: Refer to JA troubleshooting.
If the above error is not seen, refrigerant shortage
or leakage from the system can be considered. (

)
43B-## _ _ 4 3 0 2 - 0 0 —
Refrigerant shortage and refrigerant
leakage prediction (detected during
cooling operation)
■ Refrigerant leak or shortage Check for refrigerant leakage.
Check for refrigerant shortage. (

)
43C-## _ _ 4 3 0 3 - 0 0 —
Refrigerant shortage and refrigerant
leakage prediction (detected during
cooling and heating simultaneous
operation)
■ Refrigerant leak or shortage Check for refrigerant leakage.
Check for refrigerant shortage. (

)
43D-## _ _ 4 3 0 4 - 0 0 —
Refrigerant shortage and refrigerant
leakage prediction (detecting during
heating operation)
■ Refrigerant leak or shortage Check for refrigerant leakage.
Check for refrigerant shortage. (

)
47A-## _ _ 4 7 0 1 - 0 0 —
Outdoor-indoor communication failure
prediction
■ Outdoor unit control PCB
failure
■ Indoor PCB failure
■ Outdoor-indoor
communication line failure
—
Prediction code
Seven-segment display
Description Possible cause Tech tips
Produ
ct
type c
ode
Predic
tion
code
Predic
tion
sub co
de
AirNet
addres
s
display
flag