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Operation of diagnostic function
Check code
Indoor unit
before after
3 series 4 series
P03 P03
P04 H04
P05
P20
P22 P22
P26 P26
P29 P29
Cause of operation
Discharge temp. error
∗ Discharge temp. (TD) detected
temperature over the specified temp.
Case thermostat operation
∗ Abnormal overheat of compressor
Power supply voltage error
High pressure protective operation
• During cooling operation, outdoor
temp. sensor (TL) detected
temperature over specified temp.
• During heating operation, indoor
temp. sensor (TC, TCJ) detected
temperature over specified temp.
Outdoor fan system error
Short-circuit error of compressor
driving device
Position detection circuit error
Status of
air conditioner
Stop
Stop
Stop
Stop
Stop
Stop
Stop
Condition
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Displayed when
error is detected
Judgment and measures
1. Check refrigerating cycle (Gas leak)
2. Trouble of electronic expansion valve
3. Check discharge temp. sensor (TD).
1. Check case thermostat and connector.
2. Check gas leak, recharge
3. Check whether the service valve is fully opened.
4. Check PMV (Pulse Motor Valve).
5. Check broken pipe.
1. Check power supply voltage. AC198 to 264V
1. Check outdoor heat exchanger sensor (TL).
2. Check indoor heat exchanger sensor (TC, TCJ).
3. Check full open of service valve.
4. Check indoor/outdoor fan.
5. Check PMV (Pulse Motor Valve).
6. Check clogging and short circuit of indoor/outdoor heat
exchanger.
7. Overcharge of refrigerant. Recharge
1. Check lock of fan motor.
2. Check power supply voltage. AC198 to 264V
3. Check outdoor P.C. board.
1. When performing operation while taking-off compressor
wire, P26 error occurs. Check control P.C. board.
2. When performing operation while taking-off compressor
wire, an error does not occur. (Compressor rare short)
1. Check control P.C. board.