Even following the instructions, issues can occur. Here is a quick reference table:

Wait for water loop to exceed 35°C, or override the low-temp sensor safeguard. To ensure accurate system setup,4-pipe system? Share public link

Route the thermostat wires through the central hole in the mounting base.

Let the thermostat stabilize for 1 minute. The room temperature should appear.

Do not mount it near doors, windows, pipes, or ductwork.

The card typically installs directly onto the unit's main controller board or within the control section.

A small flat-head screwdriver, wire strippers, and a level.

Level the mounting base (for aesthetics) and mark the wall for two mounting holes.

The Carrier 33TBAC01 acts as a Type "B" controller (230V) for fan coil units (FCUs) with 4-pipe systems or 2-pipe systems with electric heaters. Its key features include: