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Lennox · Air conditioner

80001 IAQ persistent poor air quality

Low severity

What the control is telling you

Poor indoor air quality persists (dealer information). S30/S40 thermostat alert code 80001.

Applies to: Lennox communicating air conditioners incl. variable-capacity inverter units in S30/S40 smart thermostat systems

Likely causes

  • IAQ equipment off or not working
  • Dirty filters
  • UV lamp out

Test and repair steps

  1. Cycle power to the device.
  2. Check all IAQ equipment is powered and working.
  3. Check HC air filters, PureAir / PureAir S filter and UV lamp, ERV/HRV filter and germicidal UV lamp; replace as needed.
  4. Replace the device if nothing else fixes it.

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Source: Lennox Residential Communicating Systems Alert Code Guide (V2) 100017 (3/2023), Table 2 Alert Codes and Troubleshooting, p.51. Summarized in our own words; check the original manual for your model.

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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.