Toshiba Carrier E03 error code

What it means

The Toshiba Carrier table lists E03 as an indoor unit to remote controller regular communication error. It says data is not being received from the remote controller or network adapter.

Urgency

Likely causes

1. The indoor unit is not receiving data from the remote controller
2. The network adapter communication path is interrupted
3. The remote controller, network adapter, or indoor PCB needs service

Homeowner fix

Power cycle the system once if you can do that safely. Do not open the unit or change controller/network adapter wiring.

When to call a pro

Call a licensed HVAC technician if E03 returns. Tell them Toshiba Carrier lists E03 as an indoor-to-controller regular communication error.

Repair vs replace

This is usually a repairable communication or accessory issue. Replacement is rarely considered unless an old system also needs major boards.

• 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: check remote controller, network adapter, indoor PCB, communication wiring, and regular receive data. 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 E and three 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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