--- title: "LG refrigerator showing ER CO | RefrigeratorRepair.center" description: "What ER CO means on LG refrigerators, what to check before booking, and when it is not a failure at all." url: "https://refrigeratorrepair.center/error-codes/lg-er-co/" --- # LG refrigerator showing ER CO The main board and the display board cannot communicate. ## What ER CO actually means. The main board and the display board cannot communicate. LG gives three kinds of cause: a failed board, a loose wire between the two, or a brief problem with the power supply. LG refrigerator display · also shown as E CO, CO What to do when ER CO shows on the refrigerator ### Kind of code Communication Two boards that stopped hearing each other — the main control and the display, or the inverter. A harness is checked before a board. ### Usually leads to Controls and sensors A refrigerator cools to what it believes the temperature is, and a sensor reading wrong is obeyed perfectly. ### Shows up as Refrigerator Control Panel Not Responding Buttons do nothing, the display is blank or frozen, or settings will not hold. ### Make LG French door refrigeration with linear compressors and heavily instrumented controls. ### Source LG US support: E CO error code Shown as ER CO or E CO depending on the model. ## Before you book, in this order. Each step comes from LG's own guidance for ER CO on its refrigerators. Follow it to the end: the last card says whether this is a visit. 01 Cut the power for about five minutes, then switch it back on. 02 Note whether there was an outage or a surge recently. 03 If the same code keeps returning, book a visit. ### Still there? It usually turns into [controls and sensors](https://refrigeratorrepair.center/services/controls-and-sensors/). Book with the code and the model number. ### What not to do Do not order a board before the harness between the two boards has been checked. A loose connection gives the same code. ## What you may notice with it. The refrigerator problem ER CO tends to arrive with. Answer these at the refrigerator before anyone is booked. [All problems](https://refrigeratorrepair.center/problems/) Before you call ### [Refrigerator Control Panel Not Responding](https://refrigeratorrepair.center/problems/control-panel-not-responding/) [All 5 causes, cheapest first](https://refrigeratorrepair.center/problems/control-panel-not-responding/) Problem ### Refrigerator Control Panel Not Responding 5 causes, cheapest first Where ER CO usually leads ## Controls and sensors. **Control board · moderate.** Book a visit [What the job involves](https://refrigeratorrepair.center/services/controls-and-sensors/) ## Read these before the visit. Short guides that make the call quicker and the diagnosis cheaper. [All guides](https://refrigeratorrepair.center/guides/) What you can check yourself ### Five observations that narrow a refrigerator problem down before anyone visits What you can check yourself ### Where the model number hides, and why nothing works without it Error codes ### All 247 codes, by make ## LG refrigerators. French door refrigeration with linear compressors and heavily instrumented controls. [LG refrigerator repair](https://refrigeratorrepair.center/brands/lg/) More LG codes [dH](https://refrigeratorrepair.center/error-codes/lg-dh/) [ER IF](https://refrigeratorrepair.center/error-codes/lg-er-if/) [ER FF](https://refrigeratorrepair.center/error-codes/lg-er-ff/) [ER rF](https://refrigeratorrepair.center/error-codes/lg-er-rf/) [OF F](https://refrigeratorrepair.center/error-codes/lg-of-f/) [ER rS](https://refrigeratorrepair.center/error-codes/lg-er-rs/) [CF](https://refrigeratorrepair.center/error-codes/lg-cf/) [FS](https://refrigeratorrepair.center/error-codes/lg-fs/) [dS](https://refrigeratorrepair.center/error-codes/lg-ds/) [rT](https://refrigeratorrepair.center/error-codes/lg-rt/) [Sb](https://refrigeratorrepair.center/error-codes/lg-sb/) [C1](https://refrigeratorrepair.center/error-codes/lg-c1/) [All 14 LG codes](https://refrigeratorrepair.center/error-codes/#codes-lg) Communication on other makes [Samsung PC ER](https://refrigeratorrepair.center/error-codes/samsung-pc-er/) [Frigidaire SY CE](https://refrigeratorrepair.center/error-codes/frigidaire-sy-ce/) [Electrolux SY CE](https://refrigeratorrepair.center/error-codes/electrolux-sy-ce/) [Bosch E02](https://refrigeratorrepair.center/error-codes/bosch-e02/) [U-Line No Comm](https://refrigeratorrepair.center/error-codes/u-line-no-comm/) [True Residential Communication Error](https://refrigeratorrepair.center/error-codes/true-communication-error/) [Bertazzoni E6](https://refrigeratorrepair.center/error-codes/bertazzoni-e6/) [ASKO E0](https://refrigeratorrepair.center/error-codes/asko-e0-r31442i/) [All 18 codes of this kind](https://refrigeratorrepair.center/error-codes/#family-communication) LG builds this ### French door refrigerator Two fresh-food doors over a freezer drawer — the most common premium layout, and the one with the most to go wrong at the door line. LG builds this ### Side-by-side refrigerator Full-height freezer beside full-height fresh food, with the ice maker and dispenser built into the freezer door. ## In LG's own words > A CO appears on the display if the communication between the main board and the display PCB is not available. [LG US support: E CO error code](https://www.lg.com/us/support/help-library/lg-refrigerator-troubleshooting-an-e-co-error-code--20153150975608) Every code on this site is taken from the manufacturer's documentation, never from a forum or a parts listing. Shown as ER CO or E CO depending on the model. ## LG ER CO refrigerator repair, where we come out. The same visit in every metro below: the code, the model number, and a diagnosis before any part is ordered. 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Cut the power for about five minutes, then switch it back on. If it comes back, it needs a visit. ### Can a power blip cause ER CO on my LG refrigerator? Yes, LG lists a brief supply problem as one of the causes, alongside a loose wire and a failed board. A five-minute power cut is the owner step; note any recent outage for the technician. ### Which part is usually behind a repeat ER CO on an LG? The code only says the main board and the display board are not talking, so the link between them is checked before any board is ordered. A harness that has worked loose looks identical on the display. --- **[Read on the site: LG refrigerator showing ER CO | RefrigeratorRepair.center](https://refrigeratorrepair.center/error-codes/lg-er-co/)** **[Book a visit with RefrigeratorRepair.center](https://refrigeratorrepair.center/schedule/)**