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Samsung Air Conditioner E221 / E231 / E251 Error Code
Outdoor temperature sensor fault on Samsung air conditioners.
SamsungAll Samsung air conditioner codes
An outdoor temperature sensor is open, shorted or sending a reading the board can't use. E221 is the outdoor air sensor, E231 the condenser coil sensor and E251 the compressor discharge sensor.
Compatible models
Outdoor units for WindFree wall units in the AR**TSF series and the AC018/AC024 MNADCH high-wall units; DVM wall systems (AM***TNVD) list E221, E237 and E251.
Also shown as
Some Samsung commercial (DVM) systems use E237 for the condenser sensor instead of E231.
Difficulty
Try the basic checks, but the usual fix is a technician's job.
Not sure you are reading the code right? See how to read Samsung air conditioner codes.
How to fix Samsung E221 / E231 / E251
Try one restart
Breaker off for about five minutes, then back on and restart.
Record which code
If it comes back, note whether it's 221, 231/237 or 251. Each points to a different sensor, so the number tells the technician which part to bring.
When to call a technician
Outdoor sensors sit behind the outdoor unit's panels, so testing and replacing them is a technician job.
Parts linked to E221 / E231 / E251
These are the parts most often behind this code. Tap one to see what it does and the signs it is failing.
Order parts by your full model number so they fit.
Frequently asked questions
Which Samsung models show the E221 / E231 / E251 code?
Outdoor units for WindFree wall units in the AR**TSF series and the AC018/AC024 MNADCH high-wall units; DVM wall systems (AM***TNVD) list E221, E237 and E251.
Can I fix Samsung E221 / E231 / E251 myself?
Only the basic checks. You can safely try the steps above, but E221 / E231 / E251 usually points to a part or fault that needs a technician.
Other Samsung air conditioner codes
- CFFilter cleaning reminder
- ClAuto Clean running
- dFDefrosting the outdoor unit
- E101Indoor and outdoor units aren't communicating
- E121Room temperature sensor fault
- E122 / E123Indoor coil temperature sensor fault
- E154Indoor fan error
- E162 / E163Control board memory error
- E153 / E665Drain pump or float switch problem
- E554Refrigerant leak or low refrigerant
- E422Refrigerant flow blocked
- E458Outdoor fan error
- E416Compressor running too hot
- E461 / E464Compressor or inverter fault
- E466Power supply voltage problem
- E440 / E441Outside temperature beyond operating limit
Last reviewed 2026-10-19. Codes and steps can vary by model; check your owner's manual.