HVACopedia

Lennox · Air conditioner

41 Device control board replaced

Low severity

What the control is telling you

Appears whenever a communicating board is swapped out (AC, heat pump, furnace, air handler, damper module or PureAir S). S30/S40 alert code 41.

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

Likely causes

  • Control board replacement

Test and repair steps

  1. Confirm the new control is configured (unit size code) and the system is recommissioned.
  2. Clear the alert manually in the dealer notifications.

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Source: Lennox Residential Communicating Systems Alert Code Guide (V2) 100017 (3/2023), Table 2 Alert Codes and Troubleshooting, p.13. 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.