Lennox HVAC Error Code E5: How to Fix It

Q: What does error code E5 mean on a Lennox HVAC system?

Error code E5 indicates a suction line temperature sensor fault. The sensor is not reading correctly, which can cause the system to cycle incorrectly or shut down.

Q: Can I fix Lennox error code E5 myself?

Yes, if you have basic electrical skills and a multimeter, you can test and replace the sensor. However, if you are unsure or the problem persists, contact a professional.

Q: Where is the suction line temperature sensor located?

It's typically clamped to the large, insulated suction line near the compressor or evaporator coil. Look for a small sensor with wires connected to the control board.

Q: How do I test a suction line temperature sensor?

Disconnect the sensor and measure its resistance with a multimeter. Compare the reading to a temperature-resistance chart for your sensor type. A significantly off reading indicates a faulty sensor.

Q: Will a bad suction line sensor affect my HVAC system's performance?

Yes, a faulty sensor can cause the system to run inefficiently, short-cycle, or fail to operate, leading to higher energy bills and potential compressor damage.

Abstract

Lennox HVAC error code E5 indicates a suction line temperature sensor fault. This means the sensor that monitors the refrigerant temperature on the suction line is either malfunctioning, disconnected, or reporting abnormal readings. This can cause your system to run inefficiently or shut down as a safety precaution.