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4-4-54 Inverter Overheat error
Outdoor unit
display
∙ IGBT module internal temperature :
Judgment
Method
105°C more than (E500, E400)
∙ Cooling Pin and the IGBT junction part
assembly defective.
Cause of
∙ Refrigerant cooling heat sink and refrigerant
problem
piping assembly defective.
∙ Assembled bolt defective.
1. How to check
Power Off
IPM (IGBT) module
pin 8, 9 : Is it normally both end resistance value?
(Refer to table1)
Is the bolt of the heat sink fully tightened?
Did check the foreign objects between the heat
sink and IPM?
Did properly apply the heat sink grease?
(Between the heat sink and the IPM)
Complete
Samsung Electronics
(INVERTER1 PCB)
(INVERTER2 PCB)
Yes
Yes
Yes
Grease Service Code : DB81-02483A
Yes
Both end resistance values of IGBT module pin(8, 9 pin)
Temperature [°C] NTC [ohm]
AD [V]
Temperature [°C] NTC [ohm]
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
No
Replace Inverter PCB.
: E500(Bottom), E400 (Top)
IGBT module pin 8, 9
No
Tighten Bolt(Screw)
No
Remove foreign objects and apply the heat
sink grease. And then reassembly
Apply the heat sink grease and then
No
reassembly.
Good
Troubleshooting
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
No Good
4-113
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