Toshiba Carrier L09 error code

What it means

The Toshiba Carrier table lists L09 as indoor unit capacity not set. It says the unit capacity has not been set.

Urgency

Likely causes

1. The indoor unit capacity setting was not entered
2. Control-board setup or service replacement setup is incomplete
3. The indoor PCB is not reporting a valid capacity setting

Homeowner fix

Power cycle once if you can do that safely. Do not change capacity settings or control-board switches.

When to call a pro

Call a licensed HVAC technician if L09 returns. Tell them Toshiba Carrier identifies L09 as indoor unit capacity not set.

Repair vs replace

This is usually a setup correction. Replacement is unlikely unless a board cannot retain settings.

• 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: set indoor unit capacity and verify capacity data is retained and recognized by the control board. 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 L and nine 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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