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Lennox · Heat pump

611 High room temperature detected

High severity

What the control is telling you

Indoor temp rose over the heat alert set point (adjustable 80 F to 100 F, or 26.67 C to 37.78 C; factory 90 F / 32.22 C). Owner and dealer get a notice. S30/S40 alert code 611.

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

Likely causes

  • No cooling
  • Set point/alert setting

Test and repair steps

  1. Check why the system is not cooling (other alert codes).
  2. Clears when resolved.

Settings for these units

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Source: Lennox Residential Communicating Systems Alert Code Guide (V2) 100017 (3/2023), Table 2 Alert Codes and Troubleshooting, p.46. 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.