Multi Zone Service Manual - General

5. Trouble Shooting

- 80 -

Only for training and service purposes

PFCM :

Measuring resistance

between No.19,20 pin

Heatsink High error

Inverter PCB heatsink

sensor is open or short

1. ODU fan locking

2. Heatsink assembly of INV PCB assemble

condition abnormal

3. Defect of temperature sensing circuit part defect

of INV PCB

Display

code

Title Cause of error Check point & Normal condition

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

Check resistance between NO.24 pin and NO.25 pin

of PFC module

→ 7KΩ ±10%(at 25°C)

→ Replace PCB if 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

n Error Diagnosis and Countermeasure Flow Chart

Check Point

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

2. Check resistance between No.24 pin and NO.25 pin of PCB PFC module - only 48/56k

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

4. Check the PFC Module No.19, 20 and IPM Module No.24, 25 pin soldering condition.