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Lennox · Air handler

E202 Blower motor and unit size mismatch

High severity

What the control is telling you

The indoor unit size code does not match the blower motor size. S30/S40 thermostat alert code 202 (shown as E202 on the unit control display).

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

Likely causes

  • Wrong unit size code selected

Test and repair steps

  1. Remove the thermostat from the system while powering up and reprogramming.
  2. Set the correct unit size code per the unit installation instructions / configuration guide.
  3. Goes away once a reset is done and the right match is found.

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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.

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.