Lochinvar & A.O. Smith 100208486 Indicator Board 30067439-890 the HR54AL315 and HR54AL315A are

the HR54AL315 and HR54AL315A are technically identical components and can be used interchangeably in all documented applications

or the unit failing to initiate a defrost cycle during freezing conditions

The thermostatic element and the replaceable cartridge must be selected separately based on your specific system capacity and refrigerant requirements

Durable Material: High-purity silicon carbide design withstands thermal shock and oxidation for long-term field reliability

making it ideal for large commercial facilities with high-voltage HVAC infrastructure

Lochinvar & A.O. Smith 100208486 Indicator Board 30067439-890 the HR54AL315 and HR54AL315A areThe Lochinvar & A. O. Smith 100208486 Indicator Board is a critical diagnostic component designed for Copper Fin II boiler and water heater systems. This OEM display interface provides real time visual feedback on system status, allowing technicians to monitor the firing rate, blower power levels, and RPM diagnostics directly from the unit. As a direct replacement for legacy part numbers RLY2044 and RLY2044K, this board ensures seamless communication