LG Therma V AHBW Series

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Heatsink High error

220-240 V~ heatsink

temperature is over 85°C

1. ODU fan locking

2. Heatsink assembly of PCB assembly 1 condition

abnormal

3. Defect of temperature sensing circuit part defect

of INV PCB(Inverter)

Display

code

Title Cause of error Check point & Normal condition

n Error Diagnosis and Countermeasure Flow Chart

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.19 pin and NO.20 pin

of PFC module

→ Replace PCB(Inverter) if abnormality found

Is assemble condition

of INV PCB(Inverter)

heatsink normal ?

Is PCB(Inverter) temperature

sensing part normal ?

Yes

Check assemble condition between INV PCB(Inverter)

heatsink and PFC & IPM module → Reassemble if

abnormality found

Recheck installation condition

and connection of Heat sink

Yes

Check Point

1. Check resistance between No.19 pin and NO.20 pin of PCB PFC module

2. Resistance value should be in 7kΩ ±10%.(at 25°C).

LG Therma V AHBW Series - Page 88