SiME281906E
Troubleshooting by Error Code
Part 6 Service Diagnosis
158
Note(s)
5.24 Outdoor Unit PCB Abnormality
Applicable
Models
All outdoor unit models
Error code
L1
Method of Error
Detection
Detect error by current value during waveform output before compressor startup.
Detect error by current sensor value during synchronized operation at the time of startup.
Detect error using an PAM series capacitor overvoltage sensor.
Error Decision
Conditions
Overcurrent is detected at the time of compressor starting.
Current sensor error during synchronized operation
Overvoltage occurs in PAM.
IGBT (
1) error
EEPROM error
Supposed
Causes
Defective outdoor unit main PCB
IPM (
2) failure
Current sensor failure
PAM circuit failure
Defective IGBT or drive circuit
Inverter EEPROM failure
Defective connection of compressor connector
Compressor power supply open phase
Defective outdoor fan motor
Broken fuse
External factor (Noise, etc.)
1. IGBT: IGBT is a power semiconductor device primarily used as an electronic switch.
2. IPM: IPM is a semiconductor device for electric power incorporating the drive circuit and
self-protection feature of the power device which controls electric power.