Samsung AC E1 Error — Room Temperature Sensor Fault & How to Fix It
Quick answer
On a Samsung air conditioner, E1 means the indoor room temperature sensor (thermistor) is shorted, open or defective. The AC often refuses to start. The fix is to reseat or replace the room temperature sensor.
What does the E1 code mean?
The E1 code points to the room temperature sensor — a small thermistor inside the indoor unit that tells the control board how warm the room is. When it reads open, shorted or out of range, the AC can no longer judge the temperature, so it stops and shows E1. On some models the first character changes and number-based models blink a two-digit code; the cause and fix are the same.
Common causes
- A faulty or aged room temperature thermistor
- A loose, dirty or corroded sensor connector on the indoor PCB
- Damaged or pinched sensor wiring
- Moisture or dust affecting the sensor contacts
- Less commonly, a fault on the indoor PCB
How to fix the E1 error
Power off the unit
Switch the AC off at the wall breaker and wait a few minutes.
Open the indoor unit
Lift the front panel and remove the air filters to reach the sensor area.
Locate the room temperature sensor
Find the small bead-type thermistor in the incoming air path, wired to the control board.
Reseat the connector
Unplug and firmly reconnect the sensor plug; clean any corrosion.
Test the sensor
Measure resistance with a multimeter; open or shorted means faulty.
Replace if faulty
Fit a matching replacement thermistor for your model.
Restore power and reset
Reconnect power and confirm E1 has cleared.
Safety first: The indoor unit runs on mains electricity and sits close to the refrigerant system. Always isolate power before opening it. If E1 returns after replacing the sensor, a PCB-level fault needs a qualified technician.
Part you may need: Room temperature sensor (thermistor)
Order the sensor that matches your exact Samsung indoor model number for a correct resistance curve.