Samsung Refrigerator 85E Error — Compressor Under Voltage Fix

What it means

Samsung refrigerator 85E is the Compressor Under Voltage Error.
The inverter board measured the supply voltage falling below the minimum threshold the compressor needs to run safely, and shut the compressor down as protection.
This isn't a fridge fault first — it's a power-supply issue first.

Affected Models

Samsung French Door refrigerators with inverter compressor
Samsung Bespoke refrigerators (RF24BB, RF27BB, RF29BB series)
Samsung Side-by-Side refrigerators with inverter compressor (RS series)
Samsung 4-Door Flex models with inverter compressor
Samsung Family Hub refrigerators with inverter compressor

Common Causes

Brownout or undervoltage condition on the household supply
Fridge sharing a circuit with another large appliance
Extension cord or power strip dropping voltage (fridges should NEVER be on extension cords)
Loose plug or damaged power cord at the outlet
Failing inverter board misreading supply voltage (rare; service after household power is confirmed)

How to Fix It

Remove any extension cord or power strip.

Refrigerators should always be plugged directly into a dedicated wall outlet.
Extension cords and power strips drop voltage under the compressor's startup load and trigger 85E.
Remove any in the path and plug the fridge directly into the wall.
Unplug for 60 seconds and reset.

Pull the plug, wait 60 seconds, plug back in.
This clears the logged 85E from the inverter board.
If the actual supply voltage was a one-off dip, the reset is enough.
Confirm the outlet voltage with a tester.

An inexpensive outlet tester from any hardware store confirms in seconds whether the outlet is wired correctly and delivering proper voltage.
Standard US outlets should read 110-125V; international 220-240V.
Anything below the lower bound means the household supply or the outlet itself is the issue.
Move the fridge to a confirmed-good outlet.

If you can, try plugging the fridge into a different outlet on a known-good circuit (preferably a kitchen circuit not shared with the oven or AC).
If 85E doesn't recur on the new outlet, the original outlet or its circuit has the problem.
Call an electrician if 85E persists across outlets.

If 85E appears regardless of which outlet you try, the household supply itself is undervoltage.
This needs an electrician with a power-quality logger to identify whether it's an outage pattern, a loose feeder, or a service-side issue with the utility.
Not a Samsung service call.

When to Call a Professional

85E points at the household supply first.
If the fridge is on a dedicated outlet with no extension cord, the plug is firm, and 85E still appears — get an electrician to test supply voltage, not Samsung service.

Frequently Asked Questions

How is 85E different from 86E?

Opposite faults on the same axis.
85E means the supply voltage is too LOW for the compressor to run safely (under voltage).
86E means the supply voltage is too HIGH (over voltage — usually a surge or generator producing too-high output).
Both protect the compressor by shutting it down, but the cause and fix are different — 85E points at brownouts and loose circuits, 86E points at surges and oversized generators.