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Lennox · Air handler

E201 Blower motor communication fault

High severity

What the control is telling you

Lost communication with the indoor blower motor. S30/S40 thermostat alert code 201 (shown as E201 on the unit control display).

Applies to: Lennox communicating air handlers and EIM-equipped indoor units in S30/S40 smart thermostat systems

Likely causes

  • Power outage or brownout
  • Motor not powered
  • Loose wiring
  • Condensation on the control
  • Failed motor or control

Test and repair steps

  1. Check line power to the motor and the motor harness connections.
  2. Look for condensation on the control.
  3. Determine whether the fault is on the control or motor side.
  4. Clears when communication returns.

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Source: Lennox Residential Communicating Systems Alert Code Guide (V2) 100017 (3/2023), Table 2 Alert Codes and Troubleshooting, p.19. 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.