Carel 1tool 2.6.46 2.6.57 Sp1 [updated] May 2026

The Carel 1Tool is a software used for configuring and monitoring Carel controllers, which are widely used in HVAC (heating, ventilation, and air conditioning) and refrigeration systems. The versions you mentioned, 2.6.46 and 2.6.57 SP1, refer to specific releases of the 1Tool software, with the latter being a more updated version that includes a service pack (SP1) for additional features and bug fixes.

runtime mismatch

Users of 2.6.57 SP1 report "Upload successful, but controller freezes every 12 hours." This is usually a —the SP1 compiler optimized a variable type (likely a WORD to an INT ), and the controller's RAM cycles into an overflow. Carel 1tool 2.6.46 2.6.57 SP1

• Carel is an Italian manufacturer of controllers and supervision systems for HVAC/R (heating, ventilation, air conditioning, and refrigeration).
• "1tool" (or 1Tool) is Carel’s legacy configuration and monitoring software for their pCO, pCOsistema, and other programmable controllers. It’s largely superseded by c.suite (Carel’s modern supervision platform), but still used for older systems.
• Version 2.6.46 and 2.6.57 SP1 (Service Pack 1) appear to be two different releases. Typically, 2.6.57 SP1 would be a later maintenance update to the 2.6.x branch.

A WYSIWYG editor for creating the user interface shown on the controller's LCD screen. The Carel 1Tool is a software used for

Help Files

: Custom block help files must be saved in .htm format within the specific %APPDATA%\CAREL\1tool_custom_help\ directory. Educational Resources Carel is an Italian manufacturer of controllers and