Lennox SLP98UHV Error Code E 113: High Line Voltage
What Does Code E 113 Mean?
Error code E113 on the Lennox SLP98UHV indicates that the line voltage supplying the furnace is higher than the nameplate rating. The control board monitors incoming voltage and flags this error when it exceeds the safe operating range.
High voltage is typically caused by a utility power supply issue. The power company may be delivering excessive voltage to your neighborhood, or a neutral wire problem in your home's electrical system can cause voltage to rise on certain circuits. A faulty transformer on the utility pole serving your home is another possible cause.
Operating electronic equipment on high voltage is more damaging than low voltage — it can burn out control boards, motor windings, and other sensitive components quickly. The SLP98UHV's variable-speed motors and advanced control electronics are particularly susceptible to voltage damage. An electrician should measure the voltage at the furnace and at the main electrical panel, and contact the utility company if the voltage is consistently above the acceptable range.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Utility power supply delivering excessive voltage | Most common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Immediately — high voltage can damage furnace electronics
- An electrician should measure the voltage at the furnace and panel
- You notice other appliances behaving abnormally or light bulbs burning out frequently
- The utility company may need to be contacted about the voltage supply
✓ Verified against manufacturer service manual — March 2026