Outdoor Condenser Temperature Sensor Error
What it means
This code appears on Samsung inverter split wall units such as WindFree and Digital Inverter. It means the thermistor on the condenser pipe in the outdoor unit is open or shorted. This sensor watches condensing temperature and protects the compressor from high pressure, so the compressor normally stops. The same code can mean something else on other brands.
Models covered: Samsung inverter split air conditioners (e.g. WindFree and Digital Inverter wall units) that show three-digit E codes on the display.
Symptoms3
- E231 shows and cooling stops.
- The outdoor unit runs briefly, then stops.
- The code may be intermittent with vibration or humidity.
Possible causes5
- Sensor out of its holder on the condenser pipe, or a loose clip.
- Sensor damaged by heat and moisture.
- Wire cut or chafed on metal edges.
- Loose or corroded plug on the outdoor PCB.
- Faulty sensor input on the outdoor PCB.
How to diagnose5
- Switch off the breaker for a few minutes, then restart.
- After discharge, a technician traces the sensor wire from the condenser to the board.
- Measure the sensor resistance against the Samsung table.
- Confirm the sensor sits in its holder and the plug is clean.
- If the sensor is good, check the sensor input on the outdoor board.
How to fix5
- Refit the sensor and clean the plug.
- Repair the damaged wire and protect it from sharp edges.
- Replace the condenser sensor (it may come as an outdoor sensor set).
- Replace the outdoor PCB if the sensor is good.
- Run the unit long enough and confirm the code does not return.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
Most cases need a low-cost sensor or sensor set; the top of the range covers the outdoor PCB.
Prices are rough estimates including the part and the technician’s fee, and vary with brand, model and part source.
Prices last updated: September 2026
Frequently asked questions
Does E231 mean the condenser is dirty?
No, the code is about the sensor electrically. Technicians often wash the condenser on the same visit, though, because it is commonly dirty in dusty climates.
Why will the compressor not run without this sensor?
It protects the compressor from high condensing temperature and pressure; without a valid reading the unit cannot protect the compressor.
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This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.
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