Lennox Furnace Error Code E202

E202 indicates an indoor blower motor mismatch, meaning the horsepower of the installed blower motor does not match the expected capacity for the furnace unit. This can result from a motor installed with the wrong HP rating, or from incorrect unit size configuration settings entered during setup or after a repair. The furnace flags this fault to prevent operation outside of its designed parameters.

Resetting the furnace will temporarily clear the fault code, but E202 will return if the underlying mismatch between the blower motor horsepower and the unit configuration is not corrected. A reset does not fix incorrect configuration settings or an improperly rated motor. The root cause must be addressed before the system will operate without re-triggering the fault.

If the fix is simply a configuration correction, costs would be limited to a service call fee, typically in the range of $75 to $150 depending on your area. If the blower motor needs to be replaced because the wrong horsepower unit was installed, total costs including parts and labor generally range from $300 to $700 or more depending on the motor specification and local labor rates. Getting a diagnosis before authorizing parts replacement is the best way to control costs.

Start by checking the Unit Size Codes for your furnace or air handler in the configuration guide or installation instructions and confirm they are set correctly for your specific model. If the settings are correct, verify that the blower motor's horsepower rating matches what is specified for your unit size. If the wrong motor was installed, it will need to be replaced with the correct horsepower unit. A qualified HVAC technician can assist with both the configuration check and any motor replacement.

Operating the furnace with an E202 fault active is not recommended. A motor horsepower mismatch can result in improper airflow, which may cause the heat exchanger to overheat or the system to perform inefficiently. It is best to have the issue diagnosed and resolved before continuing regular operation to avoid potential secondary damage to components.