Lennox 12S59 Heater 320788-704 It should be replaced if

It should be replaced if there is evidence of physical corrosion

Precise OEM Fit: Ensures seamless compatibility with Amana and Goodman medium-chassis units

proof of flow

it features 15 safety-rated digital inputs and programmable user relays to manage complex sequences like valve proving

Lennox 12S59 Heater 320788-704 It should be replaced ifThe Lennox 12S59 (Model ECB25 10 P) is a high performance 10kW electric heat kit engineered for seamless integration with CBX25UH and CBX25UHV series air handlers. This OEM Lennox heater operates on a 208 240V single phase power supply, providing critical supplemental or primary heating in residential and light commercial forced air systems. As a terminal block style heat section, it is designed for simplified field installation, sliding directly into