50 PB
TROUBLESHOOTING
Diagnostic Codes
LED Display
Error
Code
Power Timer Running
1 2 3 Content The root cause is may be one of the following
16 ON OFF ON Anti-freeze protection
with cooling or overload
protection with heating in
a.the indoor coil temperature sensor connector loose.
b.the indoor coil temperature sensor failed.
c.the indoor control board failed.
d. the refrigerant system is abnormal.
17 OFF ON OFF PFC protection a.the PFC failed.
b.the outdoor drive board failed.
18 OFF ON ON DC compressor start
failure
a.the outdoor drive board failed.
b.the compressor failed.
19 OFF ON BLINK Compressor drive in
trouble
a.the outdoor drive board failed.
b.the compressor failed.
c. the outdoor control board failed.
20 ON OFF BLINK Outdoor fan motor locked
rotor protection
a.the connection of the outdoor fan motor is loose.
b.there are something blocking the outdoor fan.
c.the fan motor failed.
d.the outdoor control board failed.
21 OFF OFF BLINK Outdoor coil anti-overload
protection with cooling
a.the refrigerant charge is exxcessive.
b.the outdoor fan motor failed.
c.the outdoor fan is broken.
d.the condensor is dirty.
e.the air inlet and air outlet of the indoor unit and the
outdoor unit are abnormal.
22 Compressor pre heating
process
it is normal mode in cold weather
23 Expansion valve A tube
(thin) sensor fault
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 ON BLINK BLINK Indoor room temperature
sensor failure.
a. The indoor room temperature sensor loose;
b. The indoor room temperature sensor is failure;
c. The indoor control board is failure.
34 OFF BLINK BLINK Indoor coil temperature
sensor failure.
d. The indoor coil temperature sensor loose.
e. The indoor coil temperature sensor failed.
f. The indoor control board failed.
36 BLINK ON BLINK Communication failure
between the indoor unit
and outdoor unit
a.the communication cable connector loose.
b.the communication cable failed.
c.the connection between the lter board and the
outdoor control board is incorrect or loose.
d.the connection between the lter board and the
terminal 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.
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