Error Code . (decimal point)
Info

Lennox EL296UHV Error Code . (decimal point): Idle Mode

TL;DR
Your Lennox EL296UHV is in idle mode, standing by for a thermostat call. The blinking decimal point is normal.
Disclaimer
This article is for informational purposes only and does not guarantee the accuracy or completeness of the information provided. Always turn off power and gas supply before attempting any repairs. If you smell gas, leave immediately and call your gas company. Consult a licensed HVAC technician for diagnosis and repair. Any actions taken based on this information are at your own risk.

What Does Code . (decimal point) Mean?

A blinking decimal point on the Lennox EL296UHV seven-segment display indicates idle mode. The decimal point blinks at 1 Hertz (half a second on, half a second off), which is the standard standby indicator for this furnace. The system has completed its self-checks, found no faults, and is ready to respond when the thermostat calls for heating, cooling, or fan operation.

This is the normal resting state of the EL296UHV. You will see this display whenever the furnace is powered on but not actively running a heating or cooling cycle. The control board is continuously monitoring the thermostat signals and system sensors even while in idle.

No action is required. If you expected the furnace to be heating but it shows idle mode, check your thermostat to confirm it is set to heat and the set temperature is above the current room temperature.

When to Call a Professional

Contact a licensed HVAC technician if:

Sources

  1. Lennox EL296UHV Unit Information (Corp. 1125-L5)

✓ Verified against manufacturer service manual — March 2026