Troubleshooting
132
Samsung Electronics
4-4-85 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.
Both end resistance values of IGBT module pin(8, 9 pin)
1. Cause of problem
Temperature [°C] NTC [ohm]
AD [V]
10
9000
2.58
20
6000
2.33
30
4000
2.03
40
3000
1.80
50
2000
1.47
60
1600
1.29
70
1200
1.07
80
750
0.76
90
650
0.68
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?
Power Off
Temperature [°C] NTC [ohm]
AD [V]
100
500
0.55
105
450
0.51
110
380
0.44
120
300
0.35
130
250
0.30
140
200
0.25
* Enforce the discharge mode before Power Off.
(K2 : press the 6 times)
Good
No Good
IGBT module pin 8, 9
