Goodman Furnace: Blower motor operating in power, temperature or speed limit (reduced airflow)
Blower motor operating in power, temperature or speed limit (reduced airflow) on a Goodman furnace: Furnace is limping along at reduced output. The blower motor has backed itself off on power, temperature or speed because airflow isn't what it expects. Check the filter first. Always the filter first.
Applies to: 34.5 in chassis gas furnaces
Common causes of blower motor operating in power, temperature or speed limit (reduced airflow)
- Blocked filters
- Restrictive or undersized ductwork
- High ambient temperatures at the furnace location
How to fix blower motor operating in power, temperature or speed limit (reduced airflow): step by step
- Check filters for blockage. Clean or replace them, or remove the obstruction.
- Check ductwork for blockage. Make sure every register is fully open.
- Verify the ductwork is sized correctly for the system. Resize or replace if needed.
- Check the installation location requirements for ambient temperature limits.
- Take a temperature rise reading across the furnace after fixes and compare to the rating plate.
- Run a full cycle and confirm the blower no longer limits.
If the unit shows an error code, look it up: Goodman Furnace codes
Source: Goodman GMVC96 Service and Troubleshooting, p. 63. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.