Si18-201 Troubleshooting - Outdoor Unit Related
Service Diagnosis 265
3.3.3 Fan Lock / Overcurrent
Outdoor Unit
Indication
E7
Method of
Malfunction
Detection
Fan lock is detected using the voltage signal given to the fan and number of turns of the fan
motor.
Overcurrent is detected by the signal from driver.
Malfunction
Decision
Conditions
When the fan ran with 30rpm or less continuously for 6 seconds in the waveform output
When OCP signal was sent from the fan driver
"
When a fan lock / overcurrent is generated 4 times, the system shuts down. (The 4-time
counter resets itself when no outdoor unit abnormality occurs within 60-minute cumulative
time after the error generation.)
Supposed
Causes
"
Interference by foreign matters with propeller
"
Faulty fan PC board
"
Faulty fan motor
Troubleshooting
Check No.4
Refer to P.301
Turn the power supply off.
YES
Remove obstacles.
Replace fan motor.
Could be temporary causes
including noise, etc.
Replace fan motor.
Replace fan PC board.
Can the propeller
be turned by hands?
Is the motor position
signal output?
(MF022)
NO
Check No. 4
Fan motor position signal
check
YES
NO
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
YES
Is there any obstacles?
NO
Is this
phenomenon
re-generated when turning
the power supply
back on?
YES
NO
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