Friedrich 6 error code

What it means

The unit sees supply voltage or internal voltage outside the expected range.

Urgency

Likely causes

1. Supply voltage is higher or lower than normal
2. Inner supply voltage of the unit is higher or lower than normal

Homeowner fix

Power cycle once only if safe. If code 6 returns, the breaker trips, or home lights flicker, stop and call a technician or electrician.

When to call a pro

Call a Friedrich-qualified technician if code 6 returns. Tell them the service manual lists AC voltage higher or lower protection.

Repair vs replace

Voltage problems are usually repairable as supply or board issues; compare major board 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.73: code 6 - AC voltage higher or lower protection; causes are abnormal supply voltage or abnormal inner unit supply voltage. 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 six 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