Fujitsu ASU18RLF Service Instructions Manual page 73

Trouble shooting 28
OUTDOOR UNIT Error Method:
Over Current Error
Detective Actuators:
Outdoor unit main PCB circuit
Compressor
Forecast of Cause:
1. Outdoor Heat Exchanger clogged 2. Outdoor Fan Operation failure
4. Inverter compressor failure (lock, winding short)
Test 1 : Check ambient temp. around motor,Heat Exchanger
Check excessively high temperature around the motor.
(If there is any surrounding equipment that causes heat)
Is there anything obstructing the air distribution circuit?
Is there any clogging of Outdoor Heat Exchanger?
>> Upon the temperature coming down, restart operation.
OK
Test 2 : Check Outdoor Fan
Is the Fan rotating by hand when operation is off?
>> If the Fan Motor is locked, replace it.
OK
Test 3 : Replace Main PCB
If Test 1 - 2 do not improve the symptom, change Main PCB.
OK
Test 4 : Replace Compressor
If Test 3 do not improve the symptom, change Compressor.
Indicate of Display:
Indoor Unit
Operation lamp : 9 time Flash
Timer lamp : 4 time Flash
ERROR CODE : [E : 94]
Detective details:
"Protection stop by overcurrent generation after inverter compressor start
processing completed" generated consecutively 5 times.
* The number of generations is reset if the start-up of the compressor succeeds.
02-33
Outdoor Unit
Monitor
A B C D E
9 4
: Light ON : Light OFF n : n time blinking
3. Main PCB
F