F9
Goodman Indoor-Outdoor Capacity Mismatch or Configuration Error

Goodman inverter or mini-split displays F9 and system will not operate normally

Advertisements

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Advertisements

Possible Causes

Incorrect indoor unit model paired with outdoor unit, DIP switch or jumper settings wrong on PCB, Wrong replacement board installed, Firmware mismatch between indoor and outdoor units

How to Fix / Troubleshooting

Safety first: Turn off power to both indoor and outdoor units before opening panels.

Steps to check:

  • 1. Verify model numbers: Compare the Goodman indoor and outdoor unit model numbers to the approved matchups in the installation manual or AHRI directory.
  • 2. Inspect DIP switches/jumpers: On the indoor and outdoor PCBs, locate configuration switches. Compare their positions to the installation manual for your specific model and capacity.
  • 3. Confirm board part numbers: If a board was recently replaced, ensure the part number matches the original Goodman specification for your model.

When to call a professional: Correcting configuration or firmware mismatches often requires a technician with access to Goodman technical documentation and possibly updated boards.

Advertisements

Repair Difficulty

Hard 4/5

Required Part

Indoor control board or outdoor control board
Check Price on Amazon

We may earn a commission from links on this page.

Advertisements