Air Conditioner Samsung Updated Jul 8, 2026

Samsung AC E5 Error — Indoor Heat Exchanger Sensor Problem & Fix

E5 Samsung · Air ConditionerE5 on a Samsung AC means the indoor heat exchanger sensor is open or short. The sensor usu…

Quick answer

E5 on a Samsung AC means the indoor heat exchanger sensor is open or short. The sensor usually needs inspection or replacement.

What does the E5 code mean?

The E5 code appears when the indoor heat exchanger sensor fails electrically. This sensor monitors the temperature of the indoor coil; when it reads open or shorted, the AC flags E5 and stops normal operation.

Common causes

Failed indoor heat exchanger sensor
Loose or corroded sensor connector on the indoor PCB
Damaged sensor wiring

How to fix the E5 error

Power off

Switch off at the breaker and wait a few minutes.

Access the indoor board

Open the indoor unit and find the heat exchanger sensor connector.

Reseat and inspect

Reconnect the plug and check for corrosion or a loose pin.

Test the sensor

Measure resistance with a multimeter; open or shorted confirms failure.

Replace if needed

Fit a matching sensor for your model and reset.

Safety first: Isolate power before working inside the indoor unit. If the code persists after replacing the sensor, contact an authorised Samsung service centre.

Part you may need: Indoor heat exchanger sensor

Match the sensor to your exact Samsung indoor model for the correct resistance curve.

Frequently asked questions

Is E5 a serious error?

It stops normal cooling but is usually a straightforward sensor replacement.

Can I fix E5 myself?

If you can safely reach and test the sensor, yes; otherwise call a technician.

Written by

REZAUL Karim (Riad)

REZAUL Karim (Riad) is the founder of ErrFixHub and a hands-on electronics and home-appliance repair specialist with over 15 years of experience diagnosing and fixing air conditioners, washing machines, refrigerators, inverters and other household appliances. He built ErrFixHub to turn cryptic error codes into clear, step-by-step fixes anyone can follow — cross-checking every code against manufacturer documentation and real repair-bench experience.