Toshiba Carrier F12 error code

What it means

The Toshiba Carrier table lists F12 as TS sensor error. It says the TS sensor may be displaced, disconnected, or short-circuited.

Urgency

Likely causes

1. The TS sensor has moved out of position
2. The TS sensor is disconnected
3. The TS sensor circuit is short-circuited
4. The outdoor sensor harness or PCB input needs service

Homeowner fix

Power cycle once only if you can do that safely. Do not open the outdoor unit or reposition sensors.

When to call a pro

Call a licensed HVAC technician if F12 returns. Tell them Toshiba Carrier identifies F12 as TS sensor displaced, disconnected, or short-circuited.

Repair vs replace

A TS sensor or connection issue is usually repairable. Replacement is rarely considered unless major outdoor electronics also fail.

• 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 TS sensor placement, connector, harness, short-circuit condition, and outdoor PCB input. 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 twelve 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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