Friedrich 16 error code

What it means

The indoor coil is too cold in cooling or overloaded in heating, and the manual lists sensor, board, and refrigerant-system causes.

Urgency

Likely causes

1. Indoor coil temperature sensor connector loose
2. Indoor coil temperature sensor failed
3. Indoor control board failed
4. Refrigerant system is abnormal

Homeowner fix

Turn the system off. Make sure the filter is clean and indoor airflow is not blocked. Do not open panels or handle refrigerant parts.

When to call a pro

Call a Friedrich-qualified technician if code 16 returns. Tell them the service manual lists anti-freeze or overload protection.

Repair vs replace

Usually repairable after airflow, sensor, board, or refrigerant diagnosis; compare major sealed-system repair with replacement on older systems.

• Friedrich Floating Air Pro 9,000 BTU R-454B 115V (FAHSW09A1C / FPHSR09A1C)

  Floating Air Pro

• Friedrich Floating Air Pro 9,000 BTU R-454B 208/230V (FAHFW09A3D / FPHSR09A3D)

  Floating Air Pro

• Friedrich Floating Air Pro 12,000 BTU R-454B 115V (FAHSW12A1C / FPHSR12A1C)

  Floating Air Pro

• Friedrich Floating Air Pro 12,000 BTU R-454B 208/230V (FAHFW12A3D / FPHSR12A3D)

  Floating Air Pro

For your technician

Official Friedrich indoor diagnostic table, PDF p.74: code 16 - anti-freeze protection with cooling or overload protection with heating; listed causes are coil sensor connector, sensor, indoor board, or abnormal refrigerant system. Page context: Friedrich maps this display to the Floating Air Pro line; source: Friedrich Ductless Floating Air Pro Single Zone Service Manual, R-454B Refrigerant, 96112000_00; display convention: match the sixteen marker exactly before comparing neighboring codes.

Which systems show it

Floating Air Pro

Related troubleshooting

Use the symptom guide alongside the exact display code if the unit is flashing, cycling, or showing comfort symptoms.

Related codes

Source

Next step