The ClimateMaster 17B0003N04 Control Board is an OEM four-element electric heat controller designed for ClimateMaster water-source heat pumps and geothermal HVAC systems. This microprocessor-based board accepts 24-volt control signals to energize four electric heat elements and supports multi‑stage heating operation. Version 1.0 of the board is commonly sold as 17B0003N04 and appears in official ClimateMaster/OEM retailer listings, including SupplyHouse and Parts Town, as the ClimateMaster 17B0003N04 Control Board. It is used to manage auxiliary electric heat in ClimateMaster units, enabling staged electric heat alongside the unit’s primary heating modes.
