Lennox Furnace Error Code E270: How to Fix It

Q: What causes Lennox error code E270?

Error code E270 is caused by a faulty discharge air temperature sensor, loose wiring connections, or sensor contamination. The sensor may fail due to age, exposure to high temperatures, or electrical issues.

Q: Can I run my Lennox furnace with error code E270?

No, you should not run your furnace with error E270. This safety feature prevents overheating and potential damage to your heating system. The furnace will shut down until the sensor issue is resolved.

Q: How much does it cost to replace a discharge air temperature sensor?

A replacement discharge air temperature sensor typically costs $50-150. Professional installation may add $100-250 in labor costs, depending on your location and the complexity of access.

Q: How often should furnace temperature sensors be replaced?

Temperature sensors typically last 10-15 years under normal operating conditions. However, they may fail sooner due to power surges, extreme temperature fluctuations, or manufacturing defects.

Q: Will error code E270 affect my heating bills?

Yes, a faulty temperature sensor can cause inefficient operation before complete failure, potentially increasing your heating costs. Once the error appears, your furnace stops heating entirely until repaired.

Abstract

Lennox error code E270 indicates a failure with the discharge air temperature sensor in your furnace. This sensor monitors the temperature of heated air leaving the heat exchanger to ensure safe operation. When this sensor malfunctions, your furnace may shut down to prevent overheating or unsafe conditions.