HVACopediaLennox · Furnace
E163 Furnace control board failure
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
| Cabinet | Side return | Bottom return |
|---|---|---|
| A - 14-1/2 in. | 16 x 25 x 1 (1) | 14 x 25 x 1 (1) |
| B - 17-1/2 in. | 16 x 25 x 1 (1) | 16 x 25 x 1 (1) |
| C - 21 in. | 16 x 25 x 1 (1) | 20 x 25 x 1 (1) |
| D - 24-1/2 in. | 16 x 25 x 1 (2) | 24 x 25 x 1 (1) |
Filters are field supplied; check monthly.
Cabinet letter is the letter after the cooling size in the model number: A = 045E36AK, 070E36AK; B = 070E36BK, 090E48BK; C = 090E60CK, 110E60CK; D = 135E60DK.
Models that show this code
12 models in Lennox ML180UHE
Other codes on the same units
- E151 A2L sensor fault
- E152 Refrigerant leak sensor #2 fault
- E154 Refrigerant leak sensor #1 communication lost / wrong DIP setting
- E155 Refrigerant leak sensor #2 communication lost
- E160 Refrigerant leak sensor #1 wrong type
- E161 Refrigerant leak sensor #2 wrong type
- E164 Low GWP test mode active
- E200 Flame rollout - hard lockout
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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.