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Error
Codes Error Description
Action
J6
Outdoor heat exchanger
Same as H9.
L3
Electrical box temperature
rise
1. Restart the system.
2. Check sensor resistance value.
3. Check heat sink temperature and conditions.
4. Check outdoor fan.
5. Check the installation condition.
L4
Heat sink overheat
1. Restart the system.
2. Check the silicon grease condition on heat sink.
3. Check sensor resistance value.
4. Check heat sink temperature and conditions.
5. Check outdoor fan.
6. Check the installation condition.
L5
IPM error/IGBT error
1. Check stop valve.
2. Check with inverter checker.
3. Check the power transistor and supply voltage.
4. Check the compressor phase.
5. Check the discharge pressure.
6. Check the installation condition.
P4
Heat sink thermistor short/
open
Same as H9.