Blower motor horsepower mismatch

What is going on

The control checks the motor horsepower stored in its shared data set against the circulator blower motor that is actually installed. When they do not match, the control flags an error and will not run. Do not assume the motor is bad. A previous board swap with the wrong data set is just as likely. Switch off power and confirm both the motor and the data before changing anything, and never mix parts from another furnace.

Likely causes

• Incorrect circulator blower motor in furnace
• Incorrect shared data set in integrated control module
• Wrong memory card used on a previous control replacement

Check in this order

1. Turn power off before repair
2. Verify the circulator blower motor horsepower is the one specified for this furnace model, using the motor label and the parts list. Replace if necessary
3. Verify the shared data set is correct for the model. Re-populate with the correct memory card if required
4. Use the memory card for the specific model and insert it before turning power on
5. Power up and let the data load, then power off and remove the card per the manual
6. The error clears once shared data and motor horsepower match
7. Handle the board with static precautions

More furnace guides

• Airflow lower than demanded, furnace runs on low stage when high stage is expected
• Alternate combustion air opening (upflow or horizontal)
• Alternate vent/flue location (upflow or horizontal left)
• Annual inspection checklist
• Auxiliary limit control (location and purpose)
• Auxiliary limit switch open (blower compartment)