Indoor Control Circuit Board for Alegria Platinum FPA-48DU

ComfortStar C44690021 Indoor Control Board – OEM Replacement for Alegria Platinum FPA-48DU

The ComfortStar C44690021 is the designated indoor control circuit board for the Alegria Platinum FPA-48DU air handler. This board coordinates the internal logic required for fan motor control, sensor input processing, and communication with the outdoor unit inverter. It functions as the core logic processor within the ductless mini-split system, ensuring precise indoor operation.

Designed to meet system specifications without field modification, this OEM replacement allows for direct-fit replacement during scheduled service or fault diagnostics. The board is configured for rapid response with integrated pathways for signal communication, temperature regulation, and operational mode switching.

Board Specifications

• Part Number: C44690021
• System Application: Alegria Platinum FPA-48DU indoor unit
• Input Voltage: 24V AC (control signal)
• Control Functions: Fan speed, swing motor control, indoor temperature sensing, system communication
• Connectivity: Terminal-compatible with OEM harnesses and thermistors

Installation Details

This board is intended for installation by HVAC professionals familiar with ductless mini-split system architecture. Follow standard safety protocols including power isolation and antistatic precautions during handling. Verify all harness placements and thermistor alignment before energizing the unit.

• Skill Level: Licensed technician recommended
• Tools Required: Multimeter, insulated screwdrivers, torque driver for terminal screws
• Test Points: Room and coil thermistors, fan motor output, and communication signals

Key Features

• OEM Matched Circuitry – Engineered for direct compatibility with the FPA-48DU model
• Integrated Logic Control – Central hub for indoor unit operation and performance tuning
• Compact Form Factor – Board mounts into original factory bracket with no structural adjustments
• Stable Communication – Supports synchronized operation with inverter outdoor systems

Application Use

• Field replacement in FPA-48DU indoor handlers showing non-functional control logic
• Component swap during service calls involving fan control or indoor display failure
• Board replacement as part of scheduled maintenance or inverter communication upgrades

Summary

The ComfortStar C44690021 indoor circuit board serves as the core processor for Alegria Platinum FPA-48DU indoor units. It handles the full scope of indoor environmental control, system communication, and hardware interface logic. Ideal for professional installations, retrofits, or direct-replacement service calls where original board failure is diagnosed.