10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
289
10
Alarm code
49
Shortage of energy transfer at IDU and ODU side
• Thealarmcodeisashedonthe7-segmentdisplayoftheoutdoorunit.
• The alarm code is displayed on the wired controller of the indoor unit.
If any of the following operating conditions occur during compressor operation, the compressor will stop and retry after 3
minutes.
If the alarm is detected 3 times within 1 hour, this alarm code is displayed.
1 In cooling operation, when “indoor suction temperature is equal to or less than indoor outlet temperature and outdoor
piping temperature is equal to or less than outdoor air temperature” is maintained for 4 minutes.
2 In heating operation, when “indoor outlet temperature is below the indoor suction temperature and outdoor air
temperature is below the outdoor piping temperature” is continued for 4 minutes.
Yes
No
No
No
Yes
Yes
Yes
Each thermistor is normal
Of each thermistor the installation
is correct
Thermistor failure
Improper installation
There is no gas leak Repair of gas leaks
Charge a regular amount of refrigerant
Alarm code
50
Compressor continuously in operation under very low discharge pressure
• Thealarmcodeisashedonthe7-segmentdisplayoftheoutdoorunit.
• The alarm code is displayed on the wired controller of the indoor unit.
High pressure decrease abnormality control in Cooling mode and Low Ta.
Stop code 25 is triggered when Pd is not able to increase above 0.6 MPa when working in cooling mode and ambient
temperature is below 5ºC.
If abnormal detection occurs 2 more times within 30 minutes, this alarm code is displayed.
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