HVACopediaLennox · Furnace troubleshooting
EL296UHV: what the display and the diagnostic button are telling you
What is going on
The furnace control has a seven-segment display and one push button. Normal operation, stored errors, flame current and the unit size are all read from it.
Check in this order
- Watch the display with the furnace idle a blinking dot means idle. C, H, d, h or dF followed by a number means a call is running.
- To read stored errors, hold the button until E shows and release. The last 10 codes scroll. Choose c and press again while it flashes to clear them.
- To check the flame sensor, hold until F shows and release. Normal is 2.6 microamps or more. 2.5 or less is low. Drop out is 1.1.
- Hold until three bars show to go back to normal. Menus time out on their own.
Applies to: EL296UHV(X) series
More furnace guides
- Blower motor does not run - Lennox SL280UHV ECM checks
- Display shows two horizontal bars (soft disable) - Lennox SL297NV
- EL296UHV: normal gas heat sequence (what should happen after a call for heat)
- Furnace will not run (no heat) - Lennox EL195UHNE
- Furnace will not run (no heat) - Lennox SL297NV
- Furnace will not run - Lennox SL280UHV checklist
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Source: Lennox EL296UHV(X) Unit Information, Corp 1125-L5 (rev. 03/2022), Tables 4-5 (diagnostic modes and LED codes), printed p.32-33. Written in our own words; check the manual for your exact model.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.