Troubleshooting
45Samsung Electronics
6-3-5 When the outdoor unit fan does not operate
1. Checklist :
1) The outdoor unit fan motor operates only when the operating conditions are satisfied and is selected by the
RY74(LOW) and RY75(HI) to rotate.
2) Is the power voltage normal?
3) Is the contact of outdoor unit fan motor (CN73) good?
4) Is the winding resistance of outdoor unit fan motor 58Ω at Hi side and 143Ω at low side?
5) The outdoor unit fan motor operates with Hi at over 28°C and low at below 26°C during the cooling operation, and
operates with Hi at below 14°C and low at over 15°C during the heating operation.
2. Troubleshooting procedure
✳ Operating specification of the FAN of outdoor unit
(1) When the COMP is under the COMP ON condition during the cooling and heating operation, Hi or LOW operation is selected
according to the temperature condition of outdoor room.
(2) When A room and B room are mixed to operate , it is always under low operation.
(3) Perform the comp ON/OFF control in the dry mode.
(4) When it is under the operation of anti-freezing, overload protection, defrost operation, it may be Low, high or Off.
(5) Hi = High speed, Low = Low speed
Yes
No
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Normal (operation off)
Normal
Check the winding resistance of outdoor unit
fan motor winding resistance → Replace
Contact bad of RY74(Low), RY75(High)
→ Replace
Defect of IC06 output
→ Replace
Defect of IC04(MICOM) -
replace the IC04 or PCB ass’y
Apply the power to the outdoor unit and operate the indoor unit.
Normal
Is the indoor unit under operating conditions?
Is it operating in the High speed?
Is pin #11(12) of IC06 at low? (DC 0.7V)
Is pin #48(49) of IC04 (MICOM) at High (DC 5V)?
Is the outdoor unit fan motor under the
operating conditions?
Is the voltage shown across the connector (1)↔(3) ((1)↔(5))(the
rating voltage ±10% range)?
DB98_16045A(4)_1 1/29/04 4:56 PM Page 45
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