Multi F Four-Way Ceiling Cassette Service Manual

- 60 -

Only for training and service purposes

LGE Internal Use Only

Part 5. Trouble Shooting

Display

code

Title Cause of error Check point & Normal condition

25 Input Voltage high/low

Input voltage is over limited

value of the product (140V

or less, 300V or more)

1. Input voltage abnormal (R-S-T)

2. Outdoor unit main PCB assembly damage

(input voltage sensing part)

■ Error Diagnosis and Countermeasure Flow Chart

Yes

Recheck power and installation condition

Yes

Are there any power wire

connections normal?

Yes

1. Check L/N/G wiring conditions

→ Rewire them if abnormality found.

Is input voltage normal?

Check

R~S/S~T/T~R phase voltage is 220V 10%

→ Check connection condition and wiring if power is

abnormal

Is main PCB assembly power

connection normal?

Check connection between main PCB assembly and bridge

diode(misconnection, disconnection)

→ wiring again if abnormality found

Monitoring PCB LED display error

Replace main PCB assembly.