Samsung Error Code E3: Indoor Coil Sensor Fault
Warning: The E3 error indicates a problem with the indoor coil temperature sensor, which will prevent your Samsung mini-split from heating or cooling properly. The system is likely locked out until the issue is resolved.
How to Fix Samsung Code E3
- Step 1: Power cycle the unit. Turn off the mini-split at the breaker for 5 minutes, then turn it back on. This may reset the system and clear a temporary error.
- Step 2: Inspect the visible wiring around the indoor unit. Look for any obvious signs of damage, such as chewed wires or loose connections. Do not open the unit.
- Step 3: If the error persists after power cycling and a visual inspection, contact a qualified HVAC technician to diagnose and repair the problem.
How to Reset Samsung Code E3
- Turn off the unit using the remote control or wall controller.
- Turn off the circuit breaker for the outdoor and indoor units. Wait 60 seconds.
- Restore power at the breaker.
- Turn the unit on with the remote control. If the error returns, the fault needs professional diagnosis.
What does E3 mean?
The E3 error code on your Samsung mini-split system signifies a fault with the indoor coil temperature sensor. This sensor is responsible for monitoring the temperature of the indoor coil (the part that gets hot or cold to heat/cool your home). The sensor sends temperature readings back to the control board, which uses this information to regulate the system's operation. If the sensor is faulty, sending incorrect or no data, the control board won't know how to properly control the unit, and it will likely shut down to prevent potential damage. This means your mini-split won't heat or cool, leaving you uncomfortable. It's important to address this issue promptly to restore proper functionality.
Affected Models
Replacement Parts
| Part | OEM Number | Est. Cost |
|---|---|---|
| Indoor Coil Temperature Sensor | — | — |
| Main Control Board | — | — |
Related Codes on Same Models
| Code | Description | Severity |
|---|---|---|
| E1 | Communication Error | Warning |
| E2 | Room Temp Sensor Fault | Warning |
| E4 | Outdoor Coil Sensor Fault | Warning |
| E5 | Inverter Overcurrent | Warning |
| E6 | Outdoor Fan Motor Fault | Warning |
| E7 | Indoor Fan Motor Fault | Warning |
| E1-21 | Compressor Overcurrent | Warning |
| E1-54 | IPM Fault | Warning |
| E2-14 | Freeze Protection Active | Warning |
| E4-64 | High Pressure Trip | Warning |