10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
255
10
Alarm code
53
Activation of transistor module
• ISPM has a detection function of the abnormal operation. This alarm is displayed when the ISPM module detects
the abnormal operation 7 times or more than 7 times in 30 minutes. The retry operation is performed six times.
• Condition of activation:
- The abnormal current to the ISPM, such as short-circuited, grounded, overcurrent or control voltage decrease.
• This alarm forces all operations to stop (Outdoor & Indoor Units).
• The unit should be stopped to release the alarm.
Check the compressor.
(If there is a short-circuit
between phase lines or
grounded from any phase,
replace the compressor.)
No
Turn off power of inverter components,
disconnect U, V, W from compressor
terminals and restart.
Does the protecting function activate? *1)
Is the heat exchanger of outdoor unit
clogged?
Remove clogging.
Replace the electrical box
Yes
Yes
No
? NOTE
• *1) Ensure that the LED1 of inverter PCB (PCB2) is OFF. Then, set the DSW1 pin #1 on inverter PCB (PCB2) to ON when you are
restarting with the terminals of the compressor disconnected. After the troubleshooting, set the DSW1 pin #1 to OFF.
• When the alarm code “53” is indicated, the outdoor fan motor (DC motor) ensure that DC fan motor is checked according to the item
“10.4 Checking procedure for main parts”. Check other main parts in all cases. If there is a malfunction in DC fan motor, it may cause
damage to the inverter PCB.
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