What does FP2 - Code 5 mean on Heat Controller Heat Pump?
- PPaul WhiteSep 3, 2025
If your Heat Controller Heat Pump displays the FP2 - Code 5, which indicates an air coil low temperature limit, check for a dirty air filter and clean or replace it. Check the fan motor operation and airflow restriction, and ensure the external static is not too high by checking the static valve. If the air temperature is out of range, adjust the entering air to design parameters. For improper temperature limit settings (30°F vs. 10°F), normal airside applications will require 30°F. Check the temperature and impedance correlation per the chart.






