Lennox EL296UHV Error Code E 113: High Line Voltage
What Does Code E 113 Mean?
Code E113 on the Lennox EL296UHV means the SureLight integrated control sensed that the incoming 120V line voltage rose above the acceptable range on the unit nameplate. The control watches supply voltage in both directions — E110 is the low-voltage counterpart — because sustained overvoltage can stress the electronics that drive the variable-speed ECM blower and manage the two heating stages.
The most common cause is on the utility side: an overvoltage condition or a transient spike, which can occur during periods of low grid demand, after utility switching or maintenance, or when a large nearby load suddenly drops off. In these cases the reading is briefly high and then settles, and the alarm clears automatically once voltage is back in range.
When E113 repeats or lingers, the cause may be closer to home — a mis-set utility transformer tap, a compromised neutral connection at the meter or panel, or a wiring problem that lets voltage climb. Because E113, E110, and the 24V-side codes E115/E116 all describe the same power supply from different angles, seeing them together helps a technician decide whether the issue is your incoming mains or the furnace's own transformer. Confirming the actual supply voltage is electrician work, not a homeowner task.
What You'll Notice
- "E 113" appears on the seven-segment LED and then clears once voltage settles
- Household lights look unusually bright or flicker at the same time
- The furnace briefly pauses or restarts during utility voltage swings
- Other sensitive electronics in the home behave oddly during the same period
- The code tends to appear at times of low overall electrical demand
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Utility voltage spike or overvoltage condition | Most common | ✗ Call a pro → |
How This Is Diagnosed
A technician measures the incoming voltage at the furnace line terminals and watches whether it stays within the nameplate range or climbs above it, ideally logging it over time since overvoltage can come and go. A reading that is high at the furnace and equally high at the panel points upstream to the utility.
If the supply is genuinely running high, they check for a mis-set utility transformer tap or a neutral problem at the meter or panel and direct the issue to the power company or an electrician as appropriate. Because E113 self-clears when voltage normalizes, confirming the fix means verifying the reading stays in range under normal conditions.
When to Call a Professional
This code involves components that are not homeowner-serviceable, so have a licensed HVAC technician diagnose and repair it. Keep in mind:
- E113 appears repeatedly or persists for long stretches
- House lights are noticeably too bright or other electronics act up at the same time
- The high-voltage readings are confirmed at the panel, not just the furnace
- E113 shows up alongside E110, E115, or E116
Frequently Asked Questions
Is high voltage going to damage my furnace?
The control flags E113 precisely to protect its electronics from sustained overvoltage. A brief spike that clears is usually harmless, but repeated or prolonged high voltage should be corrected to avoid stressing the blower drive and control board.
Do I need to reset anything after E113?
No. E113 clears automatically once the voltage returns to the proper range, so the furnace resumes on its own without a manual reset.
Is the overvoltage coming from my house or the utility?
Most often it is the utility side, but a mis-set transformer tap or a neutral fault can also raise voltage. A technician measures at both the furnace and the panel to tell where the high reading originates.
✓ Verified against manufacturer service manual — March 2026