LG LMNH122LRA0 Service Manual page 121

8) Troubleshooting CH24, CH25
Display
Title
code
24
Press S/W Open
Input voltage
25
TRANS1
50Hz, DC12V
Check Point
• CH 24
1. Check the connection of "CN_PRESS"
2. Check the install condition for over load.
3. Check the SVC V/V open.
4. Check the leakage of refrigerant.
Cause of error
• Low / High press
S/W open.
• Abnormal Input voltage
(140Vac , 300Vac
• CH 25
1. Check the power source.
2. Check the components
(Trans1, B/Diode, Diode, Resistance)
Check point & Normal condition
• Check the connection of "CN_Press".
• Check the components.
• Check the power source.
. • Check the components.
CN PRESS
CN TRNAS1
Troubleshooting Guide
Service Manual 121