Samsung AM280KXVAGH/EU - Inverter Overheat Error

Troubleshooting
Samsung Electronics 4-81
4-3-54 Inverter Overheat error
Outdoor unit
display
(INVERTER1 PCB)
(INVERTER2 PCB)
Judgment
Method
 IGBT module internal temperature : 105°C more than
(E500, E400)
Cause of
problem
 Cooling Pin and the IGBT junction part assembly defective.
 Refrigerant cooling heat sink and refrigerant piping
assembly defective.
 Assembled bolt defective.
* Enf
orce the discharge mode before Power Off.
(K2 : press the 6 times)
Both end resistance values of IGBT module pin(8, 9 pin)
Table 1
Measure the resistance after the power is turned off.
Temperature [°C] NTC [ohm]
10 9000
20 6000
30 4000
40 3000
50 2000
60 1600
70 1200
80 750
1.
Cause of problem
Complete
Yes
Yes
Yes
Apply the heat sink grease and then
reassembly.
No
Did properly apply the heat sink grease?
(Between the heat sink and the IPM)
Yes
Tighten Bolt(Screw)
Remove foreign objects and apply the heat
sink grease. And then reassembly
No
No
Is the bolt of the heat sink fully tightened?
Did check the foreign objects between the heat
sink and IPM?
Replace Inverter PCB.
: E500(Bottom), E400 (Top)
No
IPM (IGBT) module
pin 8, 9 : Is it normally both end resistance value?
(Refer to table1)
Power Off
Good No Good
IGBT module pin 8, 9
Grease Service Code : DB81-02483A