Carel AL69 Error Code
Driver2 LANDisconnected O s (fixed) stable operation: Compressor 2 AL70 Built-in
Source: 030221426.pdf
What does Carel AL69 mean?
AL69 is the Driver 2 LAN Disconnected alarm on the Carel Standard Air-conditioner (030221426). The pCO controller has lost communication with EVD driver 2 on the pLAN network for more than the allowed timeout. Without a network connection, driver 2 cannot receive setpoint and control commands from the main controller, and circuit 2 may shut down or revert to digital input control only.
Symptoms
- AL69 displayed on the controller.
- Driver 2 NET LED on the EVD board is off or flashing, indicating a communication fault.
- Circuit 2 compressor may shut down or operate at a fixed valve position depending on digital input status.
- Alarm relay activates per configured relay output assignment.
Common causes
- pLAN network cable between the pCO controller and EVD driver 2 disconnected or damaged.
- Incorrect pLAN network address configured on driver 2 or the controller.
- EVD driver 2 has powered off or lost its supply voltage.
- Network communication cable too long or without proper termination.
- Electromagnetic interference from nearby variable speed drives corrupting the pLAN signal.
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Diagnostic steps
Inspect pLAN cable to EVD driver 2
Check the tLAN/pLAN cable between the pCO controller and EVD driver 2. Reseat both connectors and inspect the cable for pinching, cuts, or loose terminal screws.
Verify EVD driver 2 power supply
Confirm driver 2 is powered by checking its indicator LEDs. Measure supply voltage at the driver 2 terminals and verify it is within the specified range for the driver model.
Check network address configuration
In the EVD driver 2 service menu, verify the network address is set correctly and does not conflict with other devices on the pLAN bus. Consult the Standard Air-conditioner application installation documentation for required addresses.
Check cable routing for electromagnetic interference
Ensure the pLAN cable is not routed adjacent to high-power conductors, inverter drive cables, or other electromagnetic interference sources. Reroute and shield if necessary.
Power-cycle driver 2 and monitor recovery
After correcting wiring or address issues, power-cycle EVD driver 2. Monitor the pCO alarm list to confirm AL69 clears and driver 2 communication is restored.
When to call a professional
If AL69 persists after verifying all wiring, power, and address settings, the EVD driver 2 board or the pCO input/output expansion for the LAN port may be faulty. Board-level replacement and re-commissioning of the network connection require Carel-authorized service personnel and manufacturer access credentials.
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Sources: www.carel.it, www.carel.com