48 PB
TROUBLESHOOTING
Diagnostic Codes
Indoor Unit
Error
Code
Power Timer Running Sleep
1 2 3 4 Content The root cause is may be one of the following
23 1. The wiring of the sensor
for the expansion valve A
(thin tube) connect loose;
2. The sensor for the
expansion A(thin tube) has
failure;
3. The sampling circuit is
abnormal.
24 Outdoor board chip failure. a.Using the wrong drive board;
b.Using the wrong compressor
26 Overheated outdoor
radiator
a. Radiator sensor fails.
b. Detection circuit of the sensor on the
control panel fails.
27 Protection against too high
system pressure
a. The pressure switch fails.
b. The pressure detection switch on the
control panel fails.
c. The measured value of system pressure
exceeds the limit.
33 BLINK OFF OFF ON The failure for temperature
sensor of indoor room
a. The indoor room temperature sensor loose.
b. The indoor room temperature sensor failed.
c. The indoor control board failed.
34 BLINK OFF ON OFF The failure for temperature
sensor of indoor coil
temperature
a. The indoor coil temperature sensor loose.
b. The indoor coil temperature sensor failed.
c. The indoor control board failed.
36 BLINK ON OFF ON Communication failure
between the indoor unit
and outdoor unit
a. the communication cable connector loose.
b. the connection between the lter board
and the terminal is incorrect or loose.
c. the communication cable failed.
d. the connection between the lter board and
the outdoor control board is incorrect or loose.
e. the indoor control board failed.
f. the PFC board failed.
g. the power board failed.
h. the outdoor control board failed.
38 BLINK ON ON ON Indoor EEPROM failure a. The EEPROM chip loose;
b. The indoor control board failed.
39 BLINK OFF ON ON Indoor fan motor runs
abnormally.
a. Something blocking the indoor fan motor.
b. The fan motor cord is disconnected or
loose.
c. The fan motor failed.
d. The indoor control board failed.
41 ON ON BLINK ON The failure for Indoor
grounding protection.
The indoor control board failed.
77 ON WiFi Connection Enabled Cycle Power on/off
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