Inverter Overheat Error - Samsung AM007FN1DCH/AA Service Manual

Troubleshooting

4-4-83 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 piping
problem
assembly defective.
∙ Assembled bolt defective.
1. Cause of problem
IPM (IGBT) module pin 8, 9 :
Is it normally both end resistance value?
Is the bolt of the heat sink fully tightened?
Did check the foreign objects between the heat sink
Did properly apply the heat sink grease?
(Between the heat sink and the IPM)
4-116
(INVERTER1 PCB)
(INVERTER2 PCB)
Power Off
Yes
Yes
and IPM?
Yes
Yes
Complete
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
* Enforce the discharge mode before Power Off.
(K2 : press the 6 times)
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 reassembly.
No
Good
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
No Good
Samsung Electronics