HVACopediaLennox · Furnace
Red LED on steady Board fault detected (107163-01)
What the control is telling you
On control 107163-01 a steady (not flashing) red LED means the control found an internal fault. The cooling flowchart also calls a steady LED a circuit board failure.
Applies to: EL195UHNE furnaces with ignition control 103217-03 or 107163-01 (red LED)
Likely causes
- Failed integrated control
Test and repair steps
- Interrupt main power for a few seconds to reset the control.
- Check line voltage, polarity and ground; Check ground at the control: AC volts between line neutral and the C terminal should be about 0.3 V (2 V max) at idle, 0.75 V (5 V max) with inducer/ignitor on, under 2 V (10 V max) with blower on; line hot to neutral should be 97-132 VAC.
- If the LED stays solid on, replace the integrated control (not field repairable).
Settings for these units
- Filter sizes (filter rack kits) · Lennox EL195UHNE
Save it for the next call
Star this code in the HVACopedia app and keep the whole library on your phone for jobs with no signal.
Source: Lennox EL195UHNE Unit Information Corp 1801-L1 (rev 04/2024), Table 4 (103217-03) / Table 5 (107163-01) diagnostic codes, p.8-10; cooling flowchart p.53. Summarized in our own words; check the original manual for your model.
Homeowner looking at this code? See what it means for you and when to call a technician.
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.