Specifications

Si01-406 Check
Service Diagnosis 119
5.6 Outdoor Unit Fan System Check
Check No.9 DC motor — FT50/60CV1A
AC motor — FT25/35CV1A, FTY25/35CVMA
5.7 Power Supply Waveforms Check
Check No.10 Measure the power supply waveform between pins 1 and 3 on the terminal board, and check
the waveform disturbance.

Check to see if the power supply waveform is a sine wave (Fig.1).

Check to see if there is waveform disturbance near the zero cross (sections circled in Fig.2)
Check the outdoor unit fan system.
Reconnect.
(R2857)
Outdoor unit fan running?
YES
Fan motor lead wire
connector disconnected?
YESNO
NO
Outdoor unit fan system
functioning.
Go to Check No. 15.
Check the
fan motor lead wire
connector for secure
connection.
Abnormal
YES
NO
NO
Continuity
Are the
resistance at connector
leads ∞? 1. red - black,
2. white - black
Check the fan
capacitor for continuity.
Does the outdoor
fan rotate?
Does
the outdoor unit fan
start just after the power
is turned on?
Check the outdoor fan system.
YES
YES
NO
Normal
No continuity
Repair.
Replace the fan motor.
Replace the fan motor.
Replace the outdoor unit PCB.
The outdoor fan system is
normal.
(R2670)
[Fig.1] [Fig.2]