Samsung AM018KNQDCH/TC - Fan IPM Overheat Error

Troubleshooting
396 Samsung Electronics
4-4-72 Fan IPM Overheat error
Power Off
Ye s
Did check the foreign objects between
the heat sink pin?
Remove foreign objects
*Cold heat sink assembly defect occurs.
No
Ye s
Is the bolt of the heat sink fully tightened?
Tighten Bolt
No
Ye s
Did check the foreign objects between
the heat sink and IPM?
No
1.
Cause of problem
Complete
Remove foreign objects and
apply the heat sink grease.
And then reassembly
Outdoor unit display
(FAN1 PCB)
(FAN2 PCB)
Criteria
 IPM internal temperature more than 85°C (E455, E355)
Cause of problem
 Heat sink and IPM assembly defective.
 Defective heat sink cooling