What E231 means
The condenser sensor monitors the temperature of the outdoor heat-exchanger coil. The inverter board uses this reading to control compressor speed and protect against high-pressure conditions. An E231 fault stops the compressor.
Samsung AC E231 Error — Condenser Temperature Sensor Fault & Fix
E231
Quick answer
E231 means the condenser (outdoor coil) temperature sensor has an open or short circuit.
What does the E231 code mean?
E231 is a condenser coil temperature sensor error (open or short circuit) on the outdoor unit.
Common causes
- Faulty condenser thermistor
- Loose or corroded connector on the outdoor PCB
- Wire damage between sensor and board
- Outdoor PCB fault (rare)
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How to fix the E231 error
Isolate power
Turn the breaker off.
Find the sensor
The condenser sensor is clipped to the outdoor coil pipe, with a wire running to the outdoor PCB.
Reseat the connector
Unplug and re-plug at the PCB.
Test with a multimeter
Approximately 10 kΩ at 25°C. Replace if open or zero.
Ensure good contact
The sensor probe must be firmly clipped to the pipe.
Safety first: The outdoor coil can be very hot during cooling mode. Let the unit cool before touching the condenser pipes.
Part you may need: Condenser coil temperature sensor (NTC thermistor)
Route the replacement sensor wire away from the compressor discharge pipe to avoid heat damage.
Frequently asked questions
Is E231 the same as E6?
Similar concept (outdoor coil sensor), but E231 is the extended code used on newer Samsung inverter models.
Can a dirty condenser cause E231?
No — E231 is an electrical sensor fault. A dirty condenser causes high pressure, which is a different error.
