Multi F Four-Way Ceiling Cassette Service Manual

Part 5. Trouble Shooting
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Only for training and service purposes
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67
Fan Lock Error
Fan RPM is 10RPM or
less for 5 sec. when ODU
fan starts or 40 RPM or
less after fan starting.
1. ODU fan locking
2. Heatsink assembly of INV PCB assemble condi-
tion abnormal
3. Defect of temperature sensing circuit part defect
of INV PCB
Display
code
Title Cause of error Check point & Normal condition
Is ODU Fan Motor Assemble
condition normal?
No
Yes
Recheck power and installation condition
Check ODU Fan Motor assemble condition and fan locking
→ Reassemble or replace if abnormality found
Is ODU Fan Motor normal?
No
Yes
1. Set the multi tester to diode mode.
2. Check voltage between 1pin and 4pin of Fan Motor
(1Ţ0.2V)
3. Replace Inverter PCB if abnormality found.
Is wire connection of
ODU Fan Motor wire normal?
No
Yes
Check wiring between OUD fan motor and Inverter PCB
( Check if Hall Senor and Motor output terminal color is
matched)
→Reassemble if abnormality found
Is Inverter PCB assembly normal?
No
Yes
Replace Inverter PCB assembly
■ Error Diagnosis and Countermeasure Flow Chart
Check Point
1. Check voltage between 1pin and 4pin of Fan Mortor connector (Tester diode mode)
2. Voltage value should be in 1V ±0.2V.
3. Do not replacing all of fan motor and PCB at once.
Check error code again, after replacing the abnormal part (Fan Motor or PCB) first.