LG · Refrigerator Moderate

Er C1 — LCD display / dispenser comm error

Communication error between the LCD display assembly and the dispenser/UI board (on premium models with full LCD). Similar root cause as Er CO but specific to the larger LCD assembly.

Keep using it?
Yes, with caution
DIY difficulty
Hard
Verified against
lg.com ↗

How to fix it

  1. Unplug for 5 minutes to attempt soft reset.
  2. If error returns, open the front door panel per service manual.
  3. Reseat the ribbon between the LCD and driver board.
  4. Replace the display/LCD assembly if blank or partial.
  5. If new LCD still throws Er C1, replace the main control board.

Why it happens

Typical signs: Er C1 on display · LCD partially or fully blank · Touch controls unresponsive · Cooling continues to work

  • Loose LCD ribbon/cable Display ribbon disconnected at the panel or driver board.
  • Failed display driver board Driver PCB behind the LCD failed.
  • LCD assembly failure Backlight or panel itself dead.
  • Main board comm failure Less common; main PCB stopped talking on the bus.

Replace your water filter

A clogged or overdue water filter is a common cause of low water and ice flow on LG refrigerators — they are meant to be changed about every 6 months. The OEM-style filter that fits most LG refrigerators is the LT1000P ($45-55 OEM, $18-28 compatible).

  • LG LT1000P refrigerator water filter OEM water filter
    Amazon →

Not sure which filter fits your model? See the full compatibility guide →

Parts you may need

If diagnosis points to a failed part, these are the common replacements. As an Amazon Associate we earn from qualifying purchases.

  • LCD / display assembly Common replacement
    Amazon →
  • Main control board Common replacement
    Amazon →

Related repair guides

LG Refrigerator Water Filter Guide (LT1000P, LT800P & More) →Refrigerator Ice Maker Not Making Ice — Causes & Fix →Refrigerator Water Dispenser Slow or Not Working — Fixes →Refrigerator Water Tastes Bad or Smells — Causes & Fix →

More LG refrigerator codes

22 22 — Compressor relay / inverter control fault 33 33 — Compressor / defrost test fault 67 67 — Door open / not fully closed 88 88 — Power-on display test (not a fault) Er CF Er CF — Condenser fan motor feedback fault Er CO Er CO — Communication error (main board ↔ display)

All LG codes → All refrigerator codes →

Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: lg.com.