How do I fix error code E CH on my LG LL31H6530S?

1. undefined: Verify error using SVC App Step 1 to determine if sealed system or PCB issue. Check evaporator temperature to confirm sealed system problem. 2. undefined: Check PCB voltage outputs; if PCB voltages are abnormal, replace PCB. 3. undefined: Measure high and low side pressures and time for equalization after power off. If equalization takes more than 15 minutes, system restriction is confirmed. 4. undefined: If equalization pressure is above 20 psi, compressor is likely defective (sufficient refrigerant). Replace compressor. 5. undefined: If equalization pressure is 20 psi or less, refrigerant has leaked. Perform leak test on high pressure side (condenser, drier, compressor discharge pipe) using bubble test or leak detector. 6. undefined: If high-side leak found, replace the leaking part and drier together. 7. undefined: If no high-side leak found, inspect low-pressure side parts (evaporator, suction pipe). 8. undefined: If low-side leak found, replace the leaking part plus compressor and drier (moisture ingress risk on low side). 9. undefined: If no leak found, install UV drier and inspect at next service visit using UV light and goggles. 10. undefined: After sealed system repair, error code will disappear automatically when freezer reaches 14°F or below.

LG LL31H6530SRefrigerator

Error Code E CH

High-side cycle leakage (sealed system)

Moderate

Address soon - your appliance may not work properly

How to Fix

1
Verify error using SVC App Step 1 to determine if sealed system or PCB issue. Check evaporator temperature to confirm sealed system problem.
2
Check PCB voltage outputs; if PCB voltages are abnormal, replace PCB.
3
Measure high and low side pressures and time for equalization after power off. If equalization takes more than 15 minutes, system restriction is confirmed.
4
If equalization pressure is above 20 psi, compressor is likely defective (sufficient refrigerant). Replace compressor.
5
If equalization pressure is 20 psi or less, refrigerant has leaked. Perform leak test on high pressure side (condenser, drier, compressor discharge pipe) using bubble test or leak detector.
6
If high-side leak found, replace the leaking part and drier together.
7
If no high-side leak found, inspect low-pressure side parts (evaporator, suction pipe).
8
If low-side leak found, replace the leaking part plus compressor and drier (moisture ingress risk on low side).
9
If no leak found, install UV drier and inspect at next service visit using UV light and goggles.
10
After sealed system repair, error code will disappear automatically when freezer reaches 14°F or below.