Lennox EL296UHV Error Code E 110: Low Line Voltage
What Does Code E 110 Mean?
Error code E110 on the Lennox EL296UHV indicates that the incoming line voltage has dropped below the furnace's nameplate rating. The control board continuously monitors the supply voltage and triggers this alarm when it falls outside the acceptable range.
The most common cause is a utility-side voltage drop or brownout condition, which can affect an entire neighborhood. These events are usually temporary and resolve on their own. The alarm clears automatically 5 seconds after the voltage returns to the proper range.
If E110 appears repeatedly or persistently, the issue may be on your side of the electrical meter. An undersized circuit, long wire runs with excessive voltage drop, corroded connections at the electrical panel, or a shared circuit with a high-draw appliance can all reduce the voltage reaching the furnace. An electrician should measure the voltage at the furnace under load to determine whether a dedicated circuit or wiring upgrade is needed.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Utility voltage drop or brownout | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- E110 appears frequently or during every heating cycle
- Other appliances in the home also show signs of low voltage (dimming lights, etc.)
- The furnace shuts down completely due to voltage drops
✓ Verified against manufacturer service manual — March 2026