Toshiba Carrier F04 error code

What it means

The Toshiba Carrier table lists F04 as outdoor discharge temperature sensor TD error. It says an open or short circuit has been detected and lists the outdoor TD temperature sensor and outdoor PCB as parts to check.

Urgency

Likely causes

1. The outdoor discharge temperature TD sensor circuit is open or shorted
2. The TD sensor connector or harness needs service
3. The outdoor PCB sensor input needs service

Homeowner fix

Power cycle once only if you can do that safely. Do not open the outdoor unit or handle refrigerant-line sensors.

When to call a pro

Call a licensed HVAC technician if F04 returns. Tell them Toshiba Carrier identifies F04 as outdoor discharge temperature TD sensor error.

Repair vs replace

Outdoor sensor faults are usually repairable. Compare replacement only if an old unit also needs outdoor PCB or refrigerant-system repairs.

• Toshiba Carrier 26 High Wall 12,000 BTU R-454B 208/230V (RAV-HB121KRTP-UL / RAV-BP121AT2P-UL)

  Toshiba Carrier 26 High Wall

• Toshiba Carrier 26 High Wall 18,000 BTU R-454B 208/230V (RAV-HB181KRTP-UL / RAV-BP181AT2P-UL)

  Toshiba Carrier 26 High Wall

• Toshiba Carrier 26 High Wall 24,000 BTU R-454B 208/230V (RAV-HB241KRTP-UL / RAV-BP241AT2P-UL)

  Toshiba Carrier 26 High Wall

• Toshiba Carrier 26 High Wall 30,000 BTU R-454B 208/230V (RAV-HB301KRTP-UL / RAV-BP301AT2P-UL)

  Toshiba Carrier 26 High Wall

For your technician

Technician note: inspect TD discharge temperature sensor, connector, harness, and outdoor PCB input for open/short detection. Page context: Toshiba Carrier maps this display to the Toshiba Carrier 26 High Wall line; source: Toshiba Carrier RAV High Wall 12K-36K Installation Manual, Section 14 Troubleshooting, Error codes and parts to be checked; display convention: match the letter F and four marker exactly before comparing neighboring codes.

Which systems show it

Toshiba Carrier 26 High Wall

Related troubleshooting

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

Related codes

Source

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