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Diagnostic functional operation
Check
code
Operational cause
The 4-way valve inversion error
When the heat exchange temperature
sensor (TE) exceeds 30 °C or the
P19
suction temperature sensor (TS)
exceeds 50 °C during the heat pump
operation.
High pressure protection operation
When an abnormal stop occurs due to
the high pressure release control.
When the high pressure sensor (PD)
detects 4.05 MPa.
P20
Outdoor fan system error
When a DC fan rotor position detection
NG, element short circuit, loss of
P22
synchronization, or abnormal motor
current occurs.
Short circuit of the compressor driver
element error
When an abnormal short circuit of IGBT
is detected.
P26
Compressor rotor position error
The rotor position in the compressor
cannot be detected.
P29
Check code : H04, P04, P29
After the error is detected, It takes approximately 40 ~ 50 minutes while the error code is displayed on the remote controller.
Determination and action
Backup
Automatic
operation
reset
1. Check the operation of the 4-way
valve unit or the coil characteristics.
2. Defect of the pulse motor valve.
×
O
3. Check the resistance value of the
heat exchange temperature sensor
(TE) and the suction temperature
sensor (TS).
1. Check that the service valve is fully
open.
2. Defect of the pulse motor valve.
3. Check the outdoor fan system
(including clogging).
4. Over-filling of refrigerant.
×
O
5. Check the value of the high pressure
sensor (PD).
6. The water piping is too short.
Install a buffer tank, or set the setting
temperature lower.
1. Check the lock status of the motor
fan.
2. Check the connection of the fan
×
O
motor cable connector.
3. Check the power supply voltage.
(AC220~230 V±10%)
1. P26 abnormality occurs when
operating with the compressor
wiring disconnected ... Check the
control board.
×
O
2. No abnormality occurs when
operating with the compressor
wiring disconnected ... Compressor
rare short.
1. Even if the connection lead wire of
the compressor is disconnected, it
stops due to an abnormality in the
position detection ... Replace the
×
O
inverter control board.
2. Check the wire wound resistor of the
compressor. Short circuit
... Replace the compressor.
91
Number of
abnormalities
Detailed
for
item
confirmation
4
121
10
123
8
124
8
125
8
126
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