Carel AL65

What does Carel AL65 mean?

AL65 means Driver 1's autosetup procedure has not been completed. The autosetup is a mandatory commissioning step where the driver validates its configuration — including valve type, refrigerant, probe calibration, and system parameters — before it is allowed to regulate the expansion valve. Without completing autosetup, Driver 1 holds Circuit 1 offline indefinitely.

Symptoms

• Circuit 1 stays offline at startup regardless of operating conditions.
• AL65 is present from initial commissioning or after a parameter reset.
• Driver 1 may display an autosetup prompt on the controller interface.
• No superheat regulation occurs on Circuit 1.

Common causes

• Initial installation without completing the autosetup commissioning procedure.
• Controller parameters reset to factory defaults, clearing the autosetup completion flag.
• Incomplete autosetup due to incorrect probe or valve type selection during procedure.
• Power failure during the autosetup process before the completion flag was saved.
• Application software update that reset Driver 1 configuration.

Diagnostic steps

1. 01

   Navigate to the autosetup menu for Driver 1

   From the pCO display, access the SYSTEM SET or AUTOSETUP menu and select Driver 1. Follow the on-screen guided procedure.

2. 02

   Configure refrigerant type and valve model

   Select the correct refrigerant (e.g., R404A, R448A) and the expansion valve model installed on Circuit 1. Incorrect selections will cause control errors after autosetup completes.

3. 03

   Set probe types (S1 pressure and S2 temperature)

   Confirm the ratiometric pressure probe model and NTC temperature probe are correctly specified in the Driver 1 parameters before running autosetup.

4. 04

   Complete the autosetup sequence

   Run the full autosetup sequence. The controller will perform valve stepping tests and probe validation. Do not interrupt power during this process.

5. 05

   Reset AL65 and verify normal operation

   After autosetup completes successfully, manually reset AL65. Circuit 1 will start regulating superheat once the go-ahead is issued.

When to call a professional

If autosetup fails repeatedly or the controller cannot complete the sequence due to valve motor errors or probe faults, contact a Carel-authorized technician. Correct valve and refrigerant selection during autosetup is critical — incorrect configuration leads to chronic superheat alarms or compressor flooding and requires expert diagnosis.