Friedrich 27 error code

What it means

The system has detected or is reporting excessive pressure protection.

Urgency

Likely causes

1. Pressure switch fails
2. Pressure detection switch on the control panel fails
3. Measured system pressure exceeds the limit

Homeowner fix

Turn the system off. Check only that the outdoor unit is not blocked; do not open panels or touch refrigerant parts.

When to call a pro

Call a Friedrich-qualified technician if code 27 appears. Tell them the service manual lists protection against too high system pressure.

Repair vs replace

Pressure faults may be repairable airflow, switch, board, or refrigerant issues; compare 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 27 - protection against too high system pressure; causes are pressure switch, pressure detection switch, or measured system pressure exceeding the limit. 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 twenty seven 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