• Code: 55.01.YY
• Display: 55.01.YY DC Controller Memory Error
• Description: There is an error with the DC controller memory.
• Remedy: 1. Turn the product off and then on. 2. Perform an engine test. 3. Verify the connectors on the DC controller. 4. Replace the DC controller.

• Code: 55.02.YY
• Display: 55.02.YY Outgoing Parity Error
• Description: There is a DC controller outgoing parity error.
• Remedy: 1. Turn the product off and then on. 2. Perform an engine test. 3. Verify the connectors on the DC controller. 4. Replace the DC controller.

• Code: 55.03.YY
• Display: 55.03.YY No Engine Responsesupply unit.
• Description: DC controller no response error.
• Remedy: 1. Turn the product off and then on. 2. Perform an engine test. 3. Verify the connectors on the DC controller. 4. Replace the DC controller.

• Code: 55.04.YY
• Display: 55.04.YY Communications Timeout
• Description: There was a DC controller communications timeout.
• Remedy: 1. Turn the product off and then on. 2. Perform an engine test. 3. Verify the connectors on the DC controller. 4. Replace the DC controller.

• Code: 55.05
• Display: 55.05 Error
• Description: An interruption occurred during a remote firmware update.
• Remedy: 1. Turn the product off and then on. 2. Remove any third-party hardware. 3. Attempt the remote firmware update again.

• Code: 56.01
• Display: 56.01 - Illegal input
• Description: There was an illegal input.
• Remedy: 1. Turn the product off and then on. 2. Remove any third-party hardware. 3. Attempt the remote firmware update again.

• Code: 56.02
• Display: 56.02 - Illegal output
• Description: There was an illegal output.
• Remedy: Turn the product off and then on.

• Code: 57.01
• Display: 57.01 Error
• Description: The VOC fan (FM4) experienced an error.
• Remedy: 1. Reconnect the connectors of the VOC fan (J1921) and the DC controller PCA (J103). 2. Measure the voltage between connectors J103-4 and J103-6 on the DC controller PCA right after the product is turned on. If the voltage changes from 0V to approximately 24V, replace the VOC fan.