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[P19]
Sub-code: Detected outdoor unit No.
esuaCedoc kcehC Check code name
4-way valve reverse error
1. 4-way valve error
2. TS1 sensor/TE1 sensor error
3. Pd sensor/Ps sensor error
4. TE sensor/TL sensor misconnection
Is 4-way valve
coil connector
connected?
Are output voltage
characteristics of Pd and
Ps sensors normal?
Are
characteristics of
resistance value of TS1,
TE1 and TL sensors
normal?
Are TS1, TE1
and TL sensor
connectors connected
normally?
Does
discharge refrigerant
gas bypass to suction
side through 4-way
valve? *1
Does 4-way valve
operate?
Correct connector connection.
(4-way valve coil: CN317)
Sensor error
Sensor error
Correct connector connection
TS1 sensor: CN505
TE1 sensor: CN520
TL sensor: CN523
If no error occurs in the test
operation, restart operation.
.
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Reset the power supply and
start heating test operation.
*1 Check TS1 and TE1 temperature of the outdoor unit which is running.
(I/F) SW01=[1], SW02=[6], SW03=[2]
TS sensor temperature
SW01=[1], SW02=[7], SW03=[2]
TE sensor temperature
<Judgment criteria>
TE1 sensor: Normal if TE1 is 30°C or less in the seasons except
summer (Outside temp 20°C or lower)
TS1 sensor: Normal if TS is 50°C or less in the seasons except
summer (Outside temp 20°C or lower)
Yes
No
Yes
Yes
No
Yes
No
No
No
Yes
Yes
No
[P18]
esuaCedoc kcehC Check code name
Discharge temp TD3 error
1. Outdoor unit service valve closed
2. Outdoor PMV error
3. TD sensor error
4. Refrigerant shortage, clogging of refrigerant circuit
5. 4-way valve error
6. SV4 circuit leakage, misinstallation
Are service
valves of gas and
liquid sides fully
opened?
Are indoor units of a
different refrigerant line
connected?
Does
discharge refrigerant
gas bypass to suction
side through 4-way
valve?
Are
characteristics of TD3
sensor resistance
normal?
Connectors: PMV1: CN300,
PMV2: CN301, PMV4: CN303
(Check it using the miswiring check
function of the outdoor unit.)
(Check there is no pipe breakage, and
then recharge the refrigerant.)
Open service valves fully.
Repair outdoor PMV.
Replace TD3 sensor.
Check 4-way valve.
Correct installation of valve
coil.
Replace SV43 valve.
Correct wiring
Refrigerant shortage,
clogging, pipe breakage
Is outdoor PMV normal?
1. Connector connection
2. Wiring
3. Coil
4. Valve body
5. Outdoor I/F P.C. board
SV4 circuit
1. Are SV41, SV42 and SV43
valve coils installed correctly?
2. Is SV42 circuit sealed
correctly (no leakage)?
* See “Outdoor unit temperature sensor
characteristics” on “8-9. Sensor Characteristics”.
* See “Outdoor unit temperature sensor
characteristics” on “8-9. Sensor Characteristics”.
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