OEM Lennox Boiler Control Board — 10D84

The genuine OEM Lennox 10D84 boiler controller (factory part 240009241) is the brain of your Lennox hydronic boiler. It manages the ignition sequence, monitors flame and safety limits, sequences the burner and circulator, and coordinates the firing cycle so your boiler heats reliably and safely. It is engineered to match the exact voltage, timing, and communication logic that Lennox boiler platforms require.

Common failure symptoms: the boiler fails to ignite or locks out, intermittent no-heat calls, the burner short-cycles, error or fault codes on the control, or the circulator and burner fail to sequence correctly. Water-side corrosion, voltage spikes, and normal age can all degrade the board over time.

Why OEM matters: aftermarket or universal controls rarely replicate the precise safety timings, limit logic, and firing sequence Lennox engineered into this platform. Installing the genuine 10D84 restores factory-rated performance, preserves built-in safety protections, and keeps your equipment within warranty and code compliance. Always have a licensed technician diagnose and install boiler controls.