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Operation of diagnostic function
Judgment and measures
Check
code
Cause of operation
Status of air
conditioner
Condition
P03
Discharge temp. error
*
Discharge temp. (TD) over
specified value was detected.
Stop
Displayed when
error is detected
1. Check refrigerating cycle (Gas leak).
2. Trouble of PMV (Pulse Motor Value).
3. Check discharge temp. sensor (TD).
P04
High pressure SW system error
Stop
Displayed when
error is detected
1. Check service valves are fully opened.
(Gas side, Liquid side)
2. Check of outdoor fan operation.
3. Check clogging of outdoor PMV (Pulse Motor Valve).
4. Check clogging of heat exchanger in indoor/outdoor
units.
5. Short-circuit status of suction/discharge air in
outdoor unit.
6. Check outdoor P.C.board error.
7. Check fan system error (Cause of air volume drop)
at Indoor side.
8. Check PMV (Pulse Motor Valve) opening status in
indoor unit.
P05
Power supply error
*
Power supply voltage error
*
Open phase of 3-phase 4-wire
power supply
Stop
Displayed when
error is detected
1. Check power supply voltage. (AC342 to 457V)
2. Check open phase of 3-phase 4-wire power supply.
P07
Heat sink overheat error
*
Heat sink temp. sensor detected
over specified temperature.
Stop
Displayed when
error is detected
1. Check screw tightening between P.C.board and
heat sink and check radiator grease.
2. Check heat sink blast path.
P15
Gas leak detection
*
Discharge temp. sensor (TD),
Suction temp. sensor (TS)
detected temperature over
specified temp.
Stop
Displayed when
error is detected
1. Check gas leak, recharge.
2. Check full open of service valve.
3. Check PMV (Pulse Motor Valve).
4. Check broken pipe.
5. Check discharge temp. sensor (TD), suction temp.
sensor (TS).
P20
High pressure protective
operation
*
During cooling operation,
outdoor temp. sensor (TE)
detected temperature over
specified temp.
Stop
Displayed when
error is detected
1. Check outdoor heat exchanger sensor (TE).
2. Check full open of service valve.
3. Check indoor / outdoor fan.
4. Check PMV (Pulse Motor Valve).
5. Check clogging and short circuit of indoor / outdoor
heat exchanger.
6. Overcharge of refrigerant. Recharge.
P22
Outdoor fan system error
Stop
Displayed when
error is detected
1. Check lock of fan motor.
2. Check power supply voltage. (AC342 to 457V)
3. Check screw tightening between P.C.board and
heat sink and check radiator grease.
4. Check heat sink blast path.
5. Check outdoor P.C.board.
P26
Short-circuit of compressor
drive element
Stop
Displayed when
error is detected
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.
P29
Position detection circuit error
Stop
Displayed when
error is detected
1. Check outdoor P.C.board.
FILE NO.SVM-18044
-1
- 50 -
P19
4-Way valve system error
*
After heating operation
has started, indoor heat
exchangers temp is down.
Stop
Displayed when
error is detected
1. Check 4-Way valve.
2. Check PMV.
3. Check indoor heat exchanger (TC/TCJ)
4. Check indoor P.C. board.