LGRED Heat General Service Manual

Part 5. Trouble Shooting

- 85 -

Only for training and service purposes

LGE Internal Use Only

Heatsink High error

Inverter PCB heatsink

temperature is over 85°C

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

n Error Diagnosis and Countermeasure Flow Chart

Is Installation

Condition Normal?

1. Check Pipe Clogging/ Distortion

2. Check Covering (Outdoor/Indoor Unit)

3. Check EEV Connector Assemble Condition/Normal Operation

4. Check Refrigerant Pressure

5. Check Power Wire/ Connection Condition

Reassemble or Manage if abnormality Found

1. Check Inv. PCB Screw Connection Condition

Reassemble or Manage if abnormality Found

Inv. PCB IGBTM Connection

Condition Normal?

Yes

1. Check Outdoor Unit Fan Motor Operation or Lock

Reassemble or Manage if abnormality Found

Is ODU Fan Motor Normal?

Yes

1. Reset

Replace Inv. PCB Assembly

Is Inv. PCB assembly

Normal?

Yes

Recheck Power and

Installation Condition

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).

3. Check Inv. PCB Screw Connection Condition – only 36,42kBtu/h class