3-57
Check code
Operation cause
[08]
4-way valve reversal alarm
1. 4-way valve operation error
2. TS1sensor/TE1 sensor error
3. Pd sensor/Ps sensor error
4. Fixed-speed compressor Mg-SW operation error
Is 4-way valve cool normal?
Does 4-way valve operate?
Modify connection of connectors.
TS1 sensor : CN504
TE1 sensor : CN505
Pd sensor : CN501
Ps sensor : CN500
Restart the operation if a
trouble has not occurred
in trial operation.
Is 4-way valve coil
connector connected?
Are connectors of TS1, TE1, Pd,
and Ps sensors connected?
Is there no problem on wiring
of fixed-speed compressor?
Is fixed-speed
compressor activated?
Reset power supply and
perform trial heating operation.
Are resistance value
characteristics of TS1 and
TE1 sensors normal?
Are output voltage
characteristics of Pd and
Ps sensors normal?
Does refrigerant bypass
from discharge to suction
on 4-way valve?
Modify connector connection.
(4-way valve coil : CN317)
4-way valve error
Mg-SW error
4-way valve cool error
Sensor error
Sensor error
Correct wiring.
Check 4-way valve.
Restart the operation after
compressor IOL reset
(automatic reset).
Does OL of Mg-SW operate?
Restart the operation
after manual reset.
Does IOL of fixed-speed
compressor operate?
YES
YES
YES
YES
YES
YES
NO
NO
YES
NO
NO
NO
NO
YES
NO
YES
YES
YES
NO
NO
NO
NO
