Carel Pco5 Controller Password Guide

If a password was custom-set by a previous technician and forgotten, it cannot be bypassed from the screen interface for security reasons. To resolve this:

If the password cannot be retrieved, a hard factory reset may be required.

To input the password using the standard PGD1 built-in or remote shared display, follow these step-by-step navigation instructions:

Once you regain access to your Carel pCO5, take these three steps immediately to avoid repeating this headache:

If the controller is new out of the box and displays "INSTALLER," it may have a temporary lock. Try holding the "Prg" + "Standby" buttons for 10 seconds to reset to factory defaults without a password.

The is a highly versatile programmable controller used globally in HVAC/R (Heating, Ventilation, Air Conditioning, and Refrigeration) systems. To protect critical equipment configurations and prevent unauthorized alterations, Carel implements a tiered password protection system.

If the screen shows "Terminal Unknown," you can re-address it by holding the bottom three keys on the right (or all three right-side keys depending on the model) until a menu appears to set the terminal address, typically ensuring it is set to 32 or the specific address assigned to the controller.

HVAC units (chillers, AHUs) that use Carel controllers are often customized. The company that commissioned the unit (e.g., Trane, York, local OEM) often sets a unique, custom password. Checking the commissioning documentation or contacting them is the fastest way to find the specific . B. Perform a Factory Reset (Data Loss Risk)

If someone locked you out of Level 1 or Level 2 and you absolutely need access (e.g., to change a suction pressure setpoint or defrost schedule), try: ➡️ 1500 ⬅️

The Carel pCO5 system, especially when running standard or custom software, often utilizes multiple password levels to prevent unauthorized changes to critical operating parameters. These levels are usually categorized by user type:

: A frequent code for accessing Technician menus in specific industrial units.

If the password has been changed and lost, a factory reset may be required to restore defaults. pCOWeb Reset : Press and hold the small reset button on the card for 20 seconds while powered on Controller Initialization

If you know the brand of the chiller or air handler (e.g., Carrier, Trane, Liebert, Blue Box), contact their technical support line. Provide them with the unit's exact model number and serial number. They can usually provide the specific service password assigned to that production run. 3. Retrieve Passwords via Carel 1Tool or pCO Manager

The Ultimate Guide to Carel pCO5 Controller Passwords: Access Levels and Troubleshooting