Fridge
ER CO
The ER CO error code on an LG fridge signals a communication error between the main control board and the display panel — it’s a moderately serious fault that can prevent your fridge from operating normally but is often fixable without a full board replacement.
What does this error mean?
ER CO stands for ‘Communication Error’ and means the main PCB (printed circuit board) and the display/user interface panel have lost their data connection. The fridge detects that signals are not passing correctly between these two components. This can cause erratic behaviour, an unresponsive display, or the appliance shutting down key functions as a safety measure.
Est. repair cost
£80–£180 professional repair; wiring harness DIY part £15–£35 if that’s the confirmed cause
🔍 Likely causes
🛠️ Step-by-step fix
Hard reset first: Unplug the fridge from the wall socket and leave it completely unpowered for 10–15 minutes, then plug back in. This clears temporary firmware glitches and costs nothing.
Check your circuit breaker: Ensure the socket the fridge is on hasn’t partially tripped. Switch the breaker fully off, then back on, and retry.
Inspect the door and control panel connections (visible only): On some LG French door and side-by-side models, the display panel connects via a hinge wiring harness. Open the door fully and look for any visibly pinched, kinked, or disconnected wire at the hinge point — do not open any sealed electrical housing.
Check for error recurrence: If the code clears after a reset but returns within 24–48 hours, the fault is hardware-based (a failing board or cable) and DIY is no longer appropriate — stop here and call an engineer.
Do NOT attempt to open the main PCB housing or reseat internal boards yourself — this requires specialist tools and risks voiding any remaining warranty or causing further damage.
📞 When to call a professional
Call an LG-authorised engineer or a reputable appliance repair technician if the error code returns after a hard reset, if the display is completely blank or unresponsive, or if you cannot locate a visible wiring issue at the door hinge. Tell the engineer: ‘My LG fridge is showing ER CO — a communication error between the main board and display panel.’ This helps them bring the right parts (display board, main PCB, or harness) to the first visit.
⚖️ Repair or replace?
A professional repair for ER CO typically costs £80–£180 depending on whether it’s a wiring harness fix or a full board replacement. If your LG fridge is under 7 years old, repair is almost always the better value — LG mid-range fridges cost £600–£1,200+ new. If it’s over 10 years old and the main PCB needs replacing (£100–£150 for the part alone), weigh the repair cost carefully against a new appliance.