Indoor Control Circuit Board for Alegria Platinum TPA-18

ComfortStar C42490078 Indoor Control Board – OEM Replacement for HVAC System Control

The ComfortStar C42490078 indoor control circuit board is a factory-specified replacement module for managing electronic functions within designated ComfortStar ductless systems. This board controls fan operation, temperature input, signal communication, and mode selection within the indoor air handler.

It is engineered to restore OEM logic and sequence operations when replacing a failed or malfunctioning original board. Its form factor and terminal layout are designed for direct compatibility with compatible ComfortStar indoor units, making it suitable for field replacement by HVAC professionals.

Product Features

• Part Number: C42490078
• Application: Indoor unit control logic board
• Voltage: 24V AC system control voltage
• Mounting: Pre-aligned mounting points with integrated connector layout
• Functionality: Controls indoor fan, thermistor inputs, remote signal reception, and unit communication

Installation Notes

This control board should be installed by qualified HVAC service personnel. Before installation, power must be fully disconnected and all system components properly discharged. Connection points and wire leads should be verified against the wiring diagram specific to the indoor unit model to prevent damage or misconfiguration.

• Required Tools: Insulated screwdriver set, multimeter, static-safe work area
• Service Tip: Confirm signal continuity from all thermistors and input terminals before energizing
• Installation Type: Field replacement for service or upgrade

System Integration

The C42490078 board integrates directly with compatible indoor ComfortStar systems, restoring full operational logic for temperature regulation and communication with the outdoor unit. This component is intended for use in scheduled service or failure replacement where OEM control performance must be reestablished.

Summary

The ComfortStar C42490078 indoor control board provides reliable, manufacturer-specified control for HVAC applications using designated ComfortStar ductless indoor units. It is built for service professionals who require precise function restoration and system reliability in residential or light commercial settings.