LG Refrigerator Error Codes
ER CO, ER IF, ER RF — What They Mean & How We Fix Them
LG refrigerators display fault codes either on the front-panel temperature window or by flashing freezer/fridge digits in sequence. The ones our Twin Cities trucks see most are ER CO (linear compressor), ER IF / ER 1F (ice maker fan), ER RF and ER FF (evap / condenser fans), and ER DH (defrost heater). Some may still be covered by LG's linear-compressor warranty — check your model and serial number, and we will help you with the claim paperwork.
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Updated June 21, 2026
Quick answer
LG Refrigerator Error Code Repair — Twin Cities — Quick Answer
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How to enter LG refrigerator diagnostic mode
On many LG French-door (LFX, LFXC, LMXS, LMXC, LRMVS) and side-by-side (LSXS, LRSXS) models from 2014+, press and hold the Refrigerator + Ice Plus buttons together for 5 seconds — the display enters Smart Diagnosis / test mode and walks through compressor, fan, heater, sensor, and damper tests in sequence. The Smart Diagnosis tone (a high-pitched series of beeps) can also be played into the LG ThinQ app or the LG support phone line to decode every stored fault. To exit, hold the same two buttons again for 5 seconds, or open and close the door. On older models (2012–2014), the sequence is Lock + Refrigerator held for 5 seconds.
Most common LG refrigerator error codes
ER CO — Main board to linear-compressor inverter communication fault. Inverter board first ($385–$585), linear compressor only after inverter tests good ($785–$1,150 out of warranty; labor-only $385–$575 if LG's parts coverage applies). | ER 1F / ER IF — Ice maker fan motor: fan in the in-door ice maker stalls or fails. OEM fan motor ($285–$385). | ER RF — Refrigerator-section fan: evaporator fan behind the back wall on French-door units. Fan motor or iced shroud ($325–$485). | ER FF — Freezer evaporator fan: freezer-side fan stalled or iced. Fan motor + defrost-system check ($325–$485). | ER DH — Defrost heater: open heater element or blown thermal fuse — coil ices solid and cooling falls off. ($345–$485). | ER FS — Freezer sensor (thermistor) open/short. Cheap sensor swap ($225–$285). | ER RS — Refrigerator-section sensor open/short ($225–$285). | ER DS — Defrost sensor (bimetal thermostat) fault ($245–$345). | ER IS — Ice maker sensor (in-door ice / Craft Ice) fault. | ER 22 — Compressor relay tripping on overload — start relay or compressor draw ($285–$485). | ER 67 — Door open detected (door switch or door not closing flush). | ER CF — Condenser fan motor (under the unit) stalled or seized ($285–$385). | ER GF — Flow / pressure switch fault on dispenser water line ($225–$325). | ER HS — Humidity sensor on Craft Ice / four-door models. | F dS — Defrost-system fault (general). | CL — Control lock indicator, not a fault: hold the Lock button for about 3 seconds to release it.
LG linear-compressor warranty: check your model
LG's 10-year coverage applies to the linear compressor (and the inverter on some models), parts only, depending on your model and serial number. Check your model and serial number on LG's support site before the visit. If the part is covered, we install it and bill labor only ($385–$575); out of warranty, a linear-compressor repair typically runs $785–$1,150 all-in.
LG refrigerator repair in the Twin Cities
We stock LG inverter boards, evap and condenser fan motors, defrost heaters, thermistors, door switches, and ice-maker assemblies on the truck. Many LG refrigerator repairs can be finished in one visit across Minneapolis, Saint Paul, Edina, and Wayzata when the part is on the truck. Linear-compressor work is scheduled — we order the warranty part to your appointment date. Flat $149 trip fee, credited toward the repair when you approve it. 1-year written parts-and-labor warranty.
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FAQ
Refrigerator repair in the Twin Cities: FAQs
What does ER CO mean on an LG refrigerator?
ER CO is a communication fault between the inverter PCB and the linear compressor — the inverter board can't see the compressor. The inverter board is the first suspect, and we test its outputs before condemning the compressor. Some LG units are still inside LG's linear-compressor warranty, which usually covers the part; check your model and serial number.
What does ER 1F or ER IF mean on an LG refrigerator?
ER 1F (also displayed as ER IF on some units) is the in-door ice maker fan motor — it stalled, seized, or its sensor failed. The fix is an OEM LG ice-maker fan motor assembly, typically $285–$385 all-in. The fridge still cools normally with this code; it only affects ice production.
What does ER RF or ER FF mean on an LG refrigerator?
ER RF is the refrigerator-section evaporator fan and ER FF is the freezer-section evaporator fan. Both mean airflow has stopped — usually a seized fan motor, sometimes an iced-over fan shroud downstream of a defrost-heater failure. Repair runs $325–$485 all-in; if a defrost failure caused the icing, the heater or sensor also gets replaced in the same visit.
How do I enter LG refrigerator diagnostic mode?
On most LG French-door and side-by-side models from 2014+, hold the Refrigerator + Ice Plus buttons for 5 seconds. The display enters Smart Diagnosis and exercises compressor, fans, heater, and sensors. Older models (2012–2014) use Lock + Refrigerator held for 5 seconds. The Smart Diagnosis tone can also be played into the LG ThinQ app to decode stored faults.
Is my LG fridge still under the linear compressor warranty?
Many LG refrigerators built from 2014 on have an extended linear-compressor warranty, but the term and coverage depend on your model and purchase date. Check your model and serial number with LG, then call us with that information and we will help you work out what is covered before booking.
How much does LG refrigerator repair cost in Minneapolis?
Most LG refrigerator repairs land $345–$685 all-in. Sensor swaps $225–$285. Fan motor (ER RF / FF / 1F) $285–$485. Defrost heater (ER DH) $345–$485. Inverter board (ER CO) $385–$585. Linear compressor $785–$1,150 out of warranty, or $385–$575 labor-only if LG's parts coverage applies. The $149 trip fee is credited toward the repair when you approve it.
Can I clear an LG refrigerator error code by unplugging it?
Unplugging for 5 minutes can clear a soft fault. If the code returns within 24 hours, the underlying part has failed and a power-cycle won't fix it. Don't keep running a fridge on ER CO, ER DH, or ER RF — defrost and compressor faults compound into bigger sealed-system damage if ignored.
Do you carry OEM LG refrigerator parts?
Yes — LG inverter boards, evap and condenser fan motors, defrost heaters and sensors, ice-maker assemblies, door switches, and main control boards are stocked for the LFX, LFXC, LMXS, LMXC, LRMVS, LSXS, and LRSXS platforms.
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Pricing & repair-cost pages
Trying to decide repair vs. replace? These pages break down real Twin Cities pricing by brand, model class, and failure mode.
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Book refrigerator repair in the Twin Cities
Have your model and serial number handy. Call early and we can often get you a same-day window across the Twin Cities.
What do the Er codes on an LG refrigerator mean?
LG refrigerators show Er followed by letters when a sensor or fan circuit reports a problem. The letters name the area, such as freezer sensor or condenser fan. The code tells us where to look; it does not tell us which single part has failed.
Central Minnesota Appliance Repair reads these codes on LG French-door and side-by-side units across the Twin Cities. Match the letters on your display exactly, since upper and lower case can matter on a small panel, then compare to the code table at the top of this page.
Is an LG refrigerator fan error a defrost problem?
Sometimes. A fan code can mean the fan motor itself has failed, but ice around the fan or its shroud can also stop the blade and trigger the code. When ice builds up, the underlying cause is often the defrost system, so replacing only the fan will not hold.
That is why we check airflow and frost pattern when a fan code shows. A heavily frosted back wall in the freezer points at defrost, while a clean evaporator with a dead fan points at the fan itself. Both can happen at once.
You can look for obvious ice by emptying the freezer into a cooler and shining a light at the back panel. Do not chip at ice or pry the panel off. If the back panel is frosted, a technician needs to find out why. Our $149 trip fee is credited toward the repair when you approve it.
How do I keep food safe while I wait for a refrigerator repair?
Keep the doors closed as much as you can. A full freezer holds its temperature longer than a half-empty one. Move the most perishable food into a cooler with ice, and use a thermometer to watch the fridge section.
In a Minnesota winter, a garage or cold porch can help, but do not rely on it if temperatures swing above freezing. The USDA advises discarding perishable food that has been above 40°F for more than 2 hours, and a full freezer stays safe for about 48 hours if the door stays closed. When in doubt, throw it out.
Do not keep resetting the refrigerator to clear a code. A repeated restart will not fix a failed sensor or fan, and it may stress the compressor. If cooling has failed completely, see our refrigerator not cooling guide.
More LG refrigerator code questions
Does an Er code mean my LG refrigerator is dying?
No. Most Er codes point at a sensor or fan, which are routine repairs. A major part is a separate question that we answer after testing.
Why does my display show a code but the fridge is cold?
A fan or sensor fault may not stop cooling immediately. The code is an early warning, so schedule a check before food spoils.
Can I find my model number without moving the fridge?
Yes. It is usually on a tag inside the fridge compartment wall. Have it ready when you call.
Does LG offer compressor coverage?
LG has published warranty terms for some compressors. Check your model and purchase date with LG; we can help you read the paperwork.