Multi F Four-Way Ceiling Cassette Service Manual

Part 5. Trouble Shooting

- 74 -

Only for training and service purposes

LGE Internal Use Only

Display

code

Title Cause of error Check point & Normal condition

65 Heatsink Sensor error

Inverter PCB heatsink sen-

sor is open or short

• ODU fan locking

• Heatsink assembly of INV PCB assemble

condition abnormal

• Defect of temperature sensing circuit part defect

of INV PCB

Is installation

condition normal ?

Yes

1. Check fan locking

2. Check covering of heat exchanger

3. Check distance between ODU and obstacles

4. Check pipe distortion and abnormality

5. Check service valve is opened

-> Eliminate causes for abnormal condition

Check resistance between NO.14 pin and NO.16 pin of IPM

module

• 85kΩ ± 6.3% (at 25℃)

• Replace main PCBA it abnormality found

Is assemble condition

of INV PCB heatsink normal ?

Is PCB temperature

sensing part normal ?

Yes

Check assemble condition between INV PCB heatsink and

PFC & IPM module

-> Reassemble if abnormality found

VSS

VFO

Recheck installation condition

and connection of Heat sink

Yes

■ Error Diagnosis and Countermeasure Flow Chart