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Operation of diagnostic function
Check code
Indoor unit
4-Way
Under
High
Ceiling
Wall
P03 P03
P04
H04
P04
P05
P20
P22 P22
P26 P26
P29 P29
Cause of operation
Discharge temp. error
∗ Discharge temp. (TD) over
specified value was detected.
Case thermostat operation
∗ Abnormal overheat of compressor
High-pressure SW error
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 element
Position detection circuit error
Status of
air conditioner
Stop
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
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 full open of service valve.
4. Check PMV (Pulse Motor Valve).
5. Check broken pipe.
• Check full-open of service valve.
• Check outdoor fan error.
• Check outdoor fan motor error.
• Check clogging of outdoor PMV.
• Check loading of indoor/outdoor heat exchangers.
• Short-circuit of outdoor discharge/suction air
• Check outdoor P.C. board (I/F) error.
• Check error of fan system (air volume drop) at indoor side.
• Check miswiring of communication line between indoor and
outdoor.
• Check overcharge of refrigerant.
1. Check power supply voltage. AC198 to 253V
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 253V
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.