OEM Lennox Control Transformer — 42W93

The genuine OEM Lennox 42W93 transformer converts high-voltage line power into the stable low-voltage (typically 24V) supply that operates your thermostat, integrated control board, contactors, and safety switches. It's a small but critical component — when it stops delivering clean secondary voltage, the entire control side of your Lennox system goes dark.

Typical failure symptoms include a dead thermostat display, a furnace or air handler that won't respond to a call for heat or cool, and low-voltage fuses that blow immediately after replacement. A transformer that hums loudly, runs hot, or shows scorching or swelling is a clear candidate for replacement.

OEM matters here because the 42W93 is matched to your Lennox unit's exact VA rating, voltage taps, and mounting configuration. An off-spec aftermarket transformer can overheat, overload the circuit, or fail early. This factory-correct replacement guarantees proper fit and dependable, rated performance so your Lennox equipment powers up and operates as intended.