Main Control Board for MRCOOL ProDirect 1.5 Ton Central Air Handler – Replacement PCB

Restore your MRCOOL ProDirect system to peak performance with this OEM Replacement Main Control Board, designed specifically for the MRCOOL Pro Direct Series 1.5 Ton Central Air Handler (Model HAH15018).

This high-quality printed circuit board (PCB) manages the critical operations of your air handler, including fan control, communication functions, system safety features, and overall unit coordination. If your system is experiencing irregular operation, failure to power on, or inconsistent airflow, a malfunctioning main board may be the cause.

Key Features

• OEM Replacement Part – Built to match original MRCOOL specifications for seamless installation.

• Compatible With:

  • MRCOOL Pro Direct Series Air Handler – 1.5 Ton

  • Model: HAH15018

• Restores Full System Function – Re-establishes proper system communication, fan operation, and safety controls.

• Durable Construction – Engineered for long-term reliability and stable performance.

• Easy Replacement – Designed to fit directly in place of the factory-installed board.

When to Replace the Main Board

• System will not turn on

• Air handler fan not responding

• Fault codes related to communication failure

• Unresponsive thermostat commands

• Random cycling or system instability

Maintaining the correct control board is essential to the proper function of your MRCOOL ProDirect system. This replacement board ensures your air handler continues operating efficiently and dependably.

Stock image may be shown—actual part may differ. Model-specific replacement part.