10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
244
Alarm code
07
Decrease of Discharge Gas Superheat
This alarm code is indicated as follows:
- The temperature on the top of the compressor is less than the target and also the IU expansion valve opening is
under 300 pulses at cooling operation for 30 minutes.
- The temperature on the top of compressor is less than the target and also the OU expansion valve opening is
under 70 pulses at heating operation for 30 minutes.
- The compressor is stopped and then the retry operation is performed after 30 minutes.
No
Faulty thermistor
Yes
Yes
Heating
No
Yes
Is the thermistor
on top of compressor
normal?
Install it correctly
Is the thermistor
installed correctly on the
compressor?
Heating operation
Is it at cooling or
heating mode when the
alarm has occurred?
Cooling
Cooling operation
Yes
Yes
Check the IU expansion valve opening and the
temperature on the top of the compressor by the
outdoor unit PCB.
IU expansion valve
opening <300pls
Yes
Check the OU expansion valve opening and the
temperature on the top of the compressor by the
outdoor unit PCB.
OU expansion valve
opening <70pls
Is the temperature on the top
of compressor less than estimated
condensation temperature?
No
No
Yes
Are the connectors for the indoor
expansion valve connected properly?
- Connector on IU PCB for ex. valve
- Junction connector for ex. valve
Plug the connectors
properly
No
Yes
Is the outdoor fan normal?
Yes
Yes
Is the refrigerant correctly charged?
Is gas leaking?
Yes
Repair leaks of gas.
Correctly charge refrigerant.
No
Replace fan motor
Charge correct
refrigerant volume
Check the ex valve.
Or remove the cause
of discharge air short-
circuit at indoor and
outdoor units.
No
No
IU: Indoor Unit
OU: Outdoor Unit
No
No
Is the temperature on the top
of compressor less than estimated
condensation temperature?
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