LG R410A Service Manual page 159

Error
Error Contents
Code
Excessive rise in
34
high pressure
I Defect inspection method
1) Check the Indoor and Outdoor Unit fan and replace if required. (Refer to CH105~CH108)
2) Check if the proper heat exchange is obtained in Indoor and Outdoor Unit
Otherwise, modify the installation condition to get the proper heat exchange. Remove the outdoor cover (by dust
etc) if any and also check the Indoor Unit filter also.
3) Check the SVC valve Open and pipe condition (bent, dent etc ) .
4) Check whether the actual discharge pressure is high .
Connect the manifold gauge to the svc valve and compare the high pressure reading .
5) Check the Indoor / Outdoor Unit LEV connector connecting condition.
6) Check the LEV / Hot gas valve's coil resistance .
LEV : Resistance between each terminal of the LEV 45~90Ω
hot gas :
liquid injection :
In case the coil resistance is normal then please check the LEV/ Hot Gas Valve. (Refer to Check!!)
7) Recalculate the refrigerant charging and Check the charging condition .
8) Check the Indoor Unit pipe temp sensor connecting condition and temp sensor resistance.
(Resistance measurement method : Refer to CH02/CH06)
9) In case the above given contents are normal, then please replace the Outdoor Unit PCB.
10) In case a similar error code exists even after the replacement of the PCB, then replace the high pressure sen-
sor.
Meaning
Com. Off due to the high
pressure sensor
Main Causes
1. Defective high pressure sensor
2. Defective Indoor / Outdoor Unit fan
3. Change in shape of pipe due to the
damage
4. Excessive
refrigerant charging
5. Defective Indoor / Outdoor Unit
LEV
6. Covering or chocking (Outdoor cov-
ering during the cooling mode /
Indoor filter chocking during the
heating mode )
7. SVC valve chocked .
8. Defective outdoor PCB
9. Defective Indoor Unit pipe temp.
sensor
Troubleshooting Guide
Error display
position
Concerned
Remote con-
troller
Panel Display
Outdoor unit
Service Manual 159