Westinghouse 904531 Air Handler Control Board B4 GB4

Product Description

The WESTINGHOUSE 904531 is a replacement control board designed for B4 and GB4 series indoor air handler units. The control board manages core air handler functions including blower motor sequencing, system communication, and operational logic that coordinates heating and cooling cycles. Licensed HVAC technicians install this board as a direct OEM-style replacement when diagnosing control failures, erratic operation, or non-responsive blower behavior in compatible air handler systems. It restores proper system function without requiring full unit replacement.

This control board is intended for residential and light-commercial indoor air handler applications within the B4 and GB4 system families. It is the appropriate replacement component for air handlers identified by part numbers X36K-B, X48K-C, X60K-C, and X24K-B. Technicians servicing these units as part of a split-system maintenance or repair call should verify the existing board model and mounting configuration before installation.

Key Features

• Direct OEM-style replacement for B4 and GB4 series air handler control boards
• Manages blower motor sequencing and operational control logic
• Compatible across multiple unit configurations including X36K-B, X48K-C, X60K-C, and X24K-B
• Designed for residential and light-commercial air handler installations

Compatibility

Compatible with WESTINGHOUSE B4 and GB4 series air handler units, specifically models identified by part numbers X36K-B, X48K-C, X60K-C, and X24K-B.

Installation Notes

Installation should be performed by a licensed HVAC technician. Disconnect all electrical power to the air handler at the disconnect switch and verify zero voltage before removing the existing board or handling wiring connections. Follow all applicable local electrical codes and manufacturer wiring diagrams when reconnecting terminals to the replacement board. Do not energize the unit until all connections are secured and the enclosure is properly closed.

Technical Specifications

• Item Type: Control Board
• Used On: Air Handler
• Compatible Unit Part Numbers: X36K-B, X48K-C, X60K-C, X24K-B
• Compatible Model Series: B4, GB4

Standard Information

• Brand: WESTINGHOUSE
• Manufacturer Part Number: 904531