159
* See “Outdoor unit temperature sensor
characteristics” on “9-9. Sensor characteristics”.
* See “Outdoor unit temperature sensor
characteristics” on “9-9. Sensor characteristics”.
Check code Check code name Cause
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
Check there is no pipe breakage, and
then recharge the refrigerant.)
Refrigerant shortage,
clogging, pipe breakage
Check it using the miswiring check
function of the outdoor unit.)
Connectors: PMV1: CN300,
PMV2: CN301, PMV4: CN303
Open service valves fully.
Repair outdoor PMV.
Repair TD3 sensor.
Correct wiring.
Correct installation of valve
coil.
Replace SV43 valve.
Check 4-way valve.
Are indoor units of a
different refrigerant line
connected?
SV4 circuit
1. Are SV41, SV42 and SV43
valve coils installed correctly?
2. Is SV42 circuit sealed
correctly (no leakage)?
Does
discharge refrigerant
gas bypass to suction
side through 4-way
valve?
Are
characteristics of TD3
sensor resistance
normal?
Is outdoor PMV normal?
1. Connector connection
2. Wiring
3. Coil
4. Valve body
5. Outdoor I/F P.C. board
Are service
valves of gas and
liquid sides fully
opened?
Check code Check code name Cause
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
Sub-code: Detected outdoor unit No.
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?
Reset the power supply and
start heating test operation.
Does 4-way valve
operate?
4-way valve error
Does
discharge refrigerant
gas bypass to suction
side through 4-way
valve? *1
Check 4-way valve.
*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)
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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