Lennox 22K51 Control Board R-22 8" WC threshold from being

8" WC threshold from being met

failure to open despite receiving 24V signal

If the switch is open while the unit is cool

For contractors building Type E self-protected combination motor controllers

Common Questions What causes a blocked vent switch to trip

Lennox 22K51 Control Board R-22 8" WC threshold from beingThe Lennox 22K51 Ignition Control Board (OEM 607308 22) is a critical integrated furnace control designed for high performance service in select Lennox communicating enabled gas units. Engineered to interface with SL280UHV, SL280DFV, EL296UHV, and EL296DFV heating systems, this 120V furnace ignition module ensures precise hot surface ignitor timing and reliable flame sensing. This board replaces legacy 107045 XX series controls, providing a stable