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Operation of diagnostic function
Check code
Indoor unit
before after
3 series 4 series
H03
H03
P05
F23
H06
H06
P03 P03
H04
P04
P04
P05
P20
P22 P22
P26 P26
P29 P29
Cause of operation
Current detection circuit error
Open phase of 3-phase power
supply
Ps sensor error
Low pressure protective operation
Discharge temp. error
∗ Discharge temp. (TD) over
specified value was detected.
Case thermostat operation
∗ Abnormal overheat of compressor
High pressure SW system 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
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
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 outdoor P.C. board (MCC-1596).
(AC current detection circuit)
1. Check open phase of 3-phase power supply.
2. Black lead wire to be connected to CN03 of MCC-1596
does not pass through T611.
1. Check connection of Ps sensor connector.
2. Check failure of Ps sensor.
3. Check compressing power error of compressor.
4. Check 4-way valve error.
5. Check outdoor P.C. board error.
1. Check service valves are fully opened.
(Gas side, Liquid side)
2. Check clogging of outdoor PMV. (PMV1, 2)
3. Check SV2 circuit.
4. Check Ps sensor error.
5. Check clogging of indoor filter.
6. Check clogging of refrigerant pipe.
7. Check of outdoor fan operation. (In heating mode)
8. Check short of refrigerant.
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.
1. Check service valves are fully opened.
(Gas side, Liquid side)
2. Check of outdoor fan operation.
3. Check motor error of outdoor fan.
4. Check clogging of outdoor PMV. (PMV1, 2)
5. Check clogging of heat exchanger in indoor/outdoor units.
6. Short-circuit status of suction/discharge air in outdoor unit.
7. Check outdoor P.C. board error.
8. Check fan system error (Cause of air volume drop) at
indoor side.
9. Check PMV opening status in indoor unit.
1. Check power supply voltage. AC342 to 457V
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 between L2 and N.
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
(MCC-1596).
2. When performing operation while taking-off compressor
wire, an error does not occur. (Compressor rare short)
1. Check control P.C. board (MCC-1596).