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Lennox · Furnace

32 Device resetting

Low severity

What the control is telling you

A component is resetting itself, often during a power outage or fluctuation (information for dealer only). S30/S40 thermostat alert code 32.

Applies to: Lennox communicating gas furnaces (e.g. SL280UHV/SL280UHNV, EL296UHV) in S30/S40 smart thermostat systems

Likely causes

  • Power fluctuation
  • Overloaded transformer
  • Low 24 VAC at device
  • Failing control

Test and repair steps

  1. Check the power connections.
  2. Check amp draw at the transformer for overload.
  3. Check 24 VAC at the device.
  4. If it continues after checking connections, replace that control.
  5. To clear by hand on an S30 go to Menu > Settings > Advanced Settings, open View Dealer Control Center, tap Notifications, pick the code and tap Clear.

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.10. 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.