Samsung AM072/096/120/144FXVAFH, Service Manual

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Troubleshooting
Samsung Electronics 4-113
4-4-54 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.
Both end resistance values of IGBT module pin(8, 9 pin)
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
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
1. How to check
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