Lennox · Furnace

E163 Furnace control board failure

High severity Lennox ML180UHE

What the control is telling you

The control has an internal problem that stops normal operation. Clears when the control runs normally again.

Applies to: ML180UHEK (R-454B era) single-stage 80% furnaces with integrated control 107792-XX (ML180UH045/070/090/110/135, incl. low-NOx X models)

Likely causes

Failed integrated control 107792-XX

Test and repair steps

Warning: Disconnect power before handling the control; it is not field repairable.
Cycle power and see if the code returns.
Check line voltage (97-132 VAC hot to neutral), polarity and ground before condemning the board.
If the code persists, replace the integrated control; take ESD precautions (touch metal first).

Settings for these units

Filter sizes by cabinet width · Lennox ML180UHE

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.

Open the app

Source: Lennox ML180UHEK Unit Information 100161/100166, Table 6 Integrated Diagnostic Codes, p.14. 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.