Samsung Window Air Conditioner Error Codes — Complete Guide

Samsung window air conditioners use a two-character error code system to tell you exactly what’s wrong. Instead of guessing or calling a technician immediately, you can decode the fault, assess severity, and in most cases fix the problem yourself with basic tools. This guide covers every common Samsung window AC error code, what it means, and how to resolve it.

Quick Reference: All Samsung Window AC Error Codes

Severity key: Medium = unit shuts down but no damage risk. High = unit shuts down and continued operation could cause further damage.

E1 Error Code — Room Temperature Sensor Fault

What It Means

The E1 code means the room air temperature thermistor — a small sensor near the air intake that tells the control board the current room temperature — is reading outside its expected range or has gone open-circuit. The board can’t trust the temperature data, so it shuts cooling down.

Common Causes

• Disconnected or loose sensor connector at the control board
• Damaged sensor wire (pinched, cut, or corroded)
• Failed thermistor bead (physical damage or age)
• Extremely clogged air filter causing localized heat buildup around the sensor

DIY Fix Steps

1. Hard reset: Unplug for 5 minutes, plug back in and test.
2. Clean the air filter: A blocked filter can push sensor readings out of range.
3. Inspect the sensor wire: Remove the front panel and trace the wire from the board to the intake area. Look for kinks, cuts, or a loose connector. Reseat any loose plugs.
4. Test the thermistor: Use a multimeter in resistance (Ω) mode. At room temperature (~70°F), a healthy NTC thermistor reads 10–15kΩ. An open or shorted reading means replacement is needed.
5. Replace the sensor: NTC Thermistor Replacement (Amazon)

Detailed guide: Samsung Window AC E1 Error Code — Full Walkthrough

E2 Error Code — Evaporator Temperature Sensor Fault

What It Means

The E2 code points to the evaporator coil temperature sensor — a thermistor clipped directly to the indoor evaporator coil fins. This sensor prevents the coil from freezing by telling the board when coil temperature drops too low. When this sensor fails, the board can’t protect the coil and throws E2.

Common Causes

• Sensor clip has come loose from the coil fins
• Thermistor wire damaged during cleaning or filter replacement
• Sensor bead failure from vibration or age
• Actual evaporator icing causing abnormal sensor readings

DIY Fix Steps

1. Hard reset: Unplug for 5 minutes and retest.
2. Check for ice: If the evaporator coil is iced over, let the unit defrost fully (2–3 hours) before resetting. Ice touching the sensor can cause erratic readings.
3. Inspect the sensor clip: Remove the front panel and locate the sensor clipped to the coil. Press the clip firmly to ensure it’s making contact with the fins.
4. Test the thermistor resistance: At ~32°F (0°C), an NTC thermistor reads roughly 30kΩ. At room temperature, ~10–15kΩ. A wildly off reading confirms failure.
5. Replace the sensor: Use the same NTC thermistor kit as E1 — the sensors are often identical. Universal NTC Thermistor Kit (Amazon)

E4 Error Code — Fan Motor Failure

What It Means

E4 is the most disruptive code on this list. It means the fan motor feedback signal isn’t reaching the control board, which typically indicates the fan isn’t spinning. No fan = no airflow over the coil = no cooling. The compressor also shuts down to prevent damage.

Common Causes

• Fan blade blocked by debris or ice
• Failed run capacitor (most common cause of motor not starting)
• Seized fan motor bearings
• Open winding in the motor itself
• Loose motor feedback wire at the control board

DIY Fix Steps

1. Hard reset and listen: After unplugging and plugging back in, listen for fan sound within 5 seconds of powering on.
2. Check for obstruction: With the unit unplugged, remove the front panel and try to spin the fan blade by hand. It should spin freely.
3. Test the run capacitor: Use a multimeter in capacitance (µF) mode. A capacitor reading more than 10% below its rated value has failed. Replacement Run Capacitor (Amazon)
4. Replace the capacitor first — it’s a $10 fix that resolves a large percentage of E4 codes.
5. Replace the fan motor if the capacitor is good but the motor is seized or grinding. Universal Window AC Fan Motor (Amazon)

Detailed guide: Samsung Window AC E4 Error Code — Full Walkthrough

E5 Error Code — Condenser Temperature Sensor Fault

What It Means

The E5 code is the outdoor-side counterpart to E2. It means the condenser coil temperature sensor (mounted on the outdoor coil fins) is reading outside normal range. This sensor protects the compressor from overheating. When it fails or reads abnormally, the board shuts down the compressor.

Common Causes

• Extremely high ambient outdoor temperature (90°F+) causing legitimate high readings
• Condenser coil clogged with dust, leaves, or debris blocking heat dissipation
• Sensor connector loose at the board
• Failed thermistor

DIY Fix Steps

1. Check outdoor conditions: If the ambient temperature is above 95°F, E5 may be a legitimate overtemp protection. Turn the unit off, let it cool for 30 minutes, and retry.
2. Clean the condenser coil: Access the outdoor-facing side of the unit. Use a soft brush or compressed air to clear debris from the coil fins. A clogged condenser can spike coil temperature by 20–30°F.
3. Inspect the sensor connector: The condenser sensor wire runs from the board to the outdoor coil. Reseat the connector at the board.
4. Test and replace the sensor: Same procedure as E1/E2. Replacement Condenser Thermistor (Amazon)

EE Error Code — Control Board Memory Error

What It Means

The EE code indicates the control board’s EEPROM (non-volatile memory) has become corrupted or the board has detected an internal fault. This is less common than sensor codes and harder to resolve DIY.

Fix Steps

1. Hard reset: Unplug for 10+ minutes to fully drain board memory. Some EE codes clear on reboot.
2. Check all sensor connectors: A shorted sensor can sometimes trigger EE as a secondary fault. Disconnect and reseat all sensor plugs before assuming the board is the problem.
3. Replace the control board: If the code persists after all sensors test good, the board itself has failed. Samsung Window AC Universal Control Board (Amazon)

General Maintenance Tips to Prevent Error Codes

• Clean the air filter every 2 weeks during peak season
• Check for coil icing monthly — ice buildup near sensors causes false fault codes
• Keep the outdoor vent area clear of leaves, mulch, and debris
• Use a surge protector — power spikes are a common cause of control board and sensor faults

Recommended Parts and Tools

Related Guides

• Samsung Window AC E1 Error Code — Room Temperature Sensor Fault
• Samsung Window AC E4 Error Code — Fan Motor Failure
• All Samsung Appliance Repair Guides