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3-3-5 When the outdoor unit fan does not operate
1) Inspection items
(1) The outdoor unit fan motor operates only when the operating conditions are satisfied and is selected
by the RY74(LOW) and PY75(HI) to rotate.
(2) Is the power voltage normal?
(3) Is the contact of outdoor unit fan motor (CN 73) 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) Inspection sequence
* 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
Apply the power to the outdoor unit and operate the indoor unit.
Normal
Normal (operation off)
Normal
Check the winding resistance of outdoor unit fan
motor winding resistance → Replace
Contact bad of RY 74(Low), RY 75(High)
→ Replace
Defect of IC06 output
→ Replace
Defect of IC 04(MICOM) - replace the IC 04
or PCB ass’y
Is the indoor unit under operating conditions?
Is it operating in the High speed?
Is no. 11 ( 12) of IC 06 at low? (DC 0.7 V)
Is pin no. 48(49) of IC 04 (MICOM) at High (DC 5 V)?
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)?
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
DB98_05645A(1)_1 5/30/02 7:04 PM Page 15