Lockout occurs after the three-try ignition sequence fails to detect a flame sense signal

Universal Compatibility: Identical to the 21-238 and compatible with KMC CSC-1000

allowing different field devices to communicate effectively with the main controller

and oil primary control

cleaning the sensor or replacing the LH33EW058 usually resolves this

Lennox 13W13 Blower Relay 320734-701 Lockout occurs after the three-tryThe Lennox 13W13 Blower Relay is a genuine OEM 24V furnace fan control relay designed for precise blower motor activation in residential and light commercial HVAC systems. This HVAC blower relay replacement serves as the critical switching interface between the low voltage thermostat circuit and the high voltage blower motor, ensuring the fan cycles correctly during heating and cooling demands. Engineered to exact factory specifications, the Lennox