It does not require a manual button press to restart once the system cools to 220°F

Reliable Flame Rectification: Delivers a stable microamp signal to the control board

Designed to deliver 15KV to 25KV of spark energy from the ignition control to the electrode

ensuring the element reaches the hottest water at the top of the tank

2A threshold

Lennox 53J09 Limit Switch It does not require aThe Lennox 53J09 Limit Switch is a high precision safety component engineered for HVAC system protection and thermal monitoring. This 170 210F AUTO Limit Switch functions as a critical high limit control, automatically opening the circuit if the heater exchange or plenum temperature exceeds the 210F threshold and resetting once temperatures drop to the 170F differential. Designed for seamless integration into Lennox furnaces and air handlers, this OEM