Carel Pco5 Controller Password

| Display Message | Meaning | Solution | | :--- | :--- | :--- | | PASS (flashing) | Wrong password entered 3x | Wait 60 seconds (lockout timer). Cycle power or try a different level. | | InAC | Invalid access | The parameter is forbidden at all levels. Only editable via software. | | rEAd | Read-only | You have the correct password, but this is a live diagnostic value (cannot be changed). | | LOC or LOCL | Controller locked by remote supervisor | A BMS (Building Management System) has locked the keypad. Disable remote write via BMS. |

Once you regain access (or install a new PCO5), take these three steps immediately:

The Carel PCO5 password system is secure but sometimes overly restrictive. For everyday maintenance, it’s fine. For legacy or undocumented systems, it becomes a major obstacle. Best practice: always document and store the password physically near the controller. If you’re an OEM, set a recoverable default and include it in delivery docs.

Pro tip for techs: If you regularly service Carel PCO5 units, invest in the Carel pCO Manager software and a USB programming cable – it’s the only reliable way to override or recover passwords without vendor help.

Accessing the protected menus on a Carel pCO5 controller typically requires specific passwords depending on the access level and the Original Equipment Manufacturer (OEM) configuration. Common Default Passwords Technician / Manufacturer Menu:

The most standard default password for CAREL pCO series controllers to access technician or factory settings is Operator Level: For basic setpoint adjustments, some systems use as the operator-level password. Manufacturer Specific: carel pco5 controller password

Certain implementations or specific parameters (like PLAN addresses) may use Web Interface (pCOWeb):

If you are accessing the controller via a network browser, the default credentials are often (username) and (password). How to Enter the Password Navigate to the Menu: button on the keypad. Select Access Level: Scroll using the

arrows to find the "Technician" or "Settings" menu and press Input Code:

When the password prompt appears (often a flashing "0"), use the arrow to scroll to the desired code (e.g., 1234).

to gain access. If the code is correct, the protected sub-menus will unlock. Important Notes OEM Customization: | Display Message | Meaning | Solution |

Many manufacturers (like Carrier, Aermec, or United Cool Air) change the default CAREL passwords to their own proprietary codes (e.g.,

does not work, you should refer to the specific manual provided by your equipment manufacturer. Automatic Logout:

Logins typically expire after a few minutes of inactivity to prevent unauthorized access. Parameter 22: Note that while some smaller CAREL controllers (like the as a standard password, the

is a larger programmable platform that more commonly uses the four-digit codes mentioned above. specific menu navigation

steps for a particular task, such as changing setpoints or updating firmware? UNITED COOL AIR | CAREL PCO CONTROLLER PASSWORD Accessing the protected menus on a Carel pCO5

If the controller has never been modified by an OEM or installer, these are documented in Carel’s pCO5 programmer manual:

After a factory reset (via jumper on the board + power cycle), these defaults are restored. However, performing a factory reset erases all application logic – an impractical step for a live system.

You have tried 2222, 3333, and 0000. The screen still says PASS and refuses access. This is a common and frustrating scenario. Here is why this happens and how to fix it.

| Scenario | Immediate Action | |----------|------------------| | Controller brand new, never programmed | Try 1234 (Pr2) or 4321 (Pr3) | | Frozen supermarket rack / OEM chiller | Check OEM manual; try 1500, 3452, 4567 | | You have physical access and a laptop | Connect via USB-RS485 to pCOStudio – read application without password | | Nothing works & you have original application file | Perform JP4 reset, then reload the .bin or .pco file | | Customer changed it and forgot | No recovery except above methods – no "master override" |

The pCO5 system typically utilizes a "Key" system. Passwords are entered to virtually insert a "key" into the system.

There are three standard access levels on most pCO5 boards: