ensuring a secure electrical interface between the high-limit switch and the thermocouple circuit

it is recommended to mount the solenoid with the coil in an upright vertical position

always ensure your control air is clean

Check for carbon deposits or "soot" on the electrode

The Lennox 23J28 Mounting Bracket is a critical OEM replacement part engineered specifically for direct-drive blower motors in high-performance HVAC systems

Lochinvar & A.O. Smith 100208661 Flow Switch 321894-706 ensuring a secure electrical interfaceThe Lochinvar & A. O. Smith 100208661 Flow Switch, also identified by part number 781621 or alias FS8 W, is a heavy duty liquid flow switch engineered for precise proof of flow detection in high efficiency commercial boiler systems and water heaters. Designed as a direct HVAC replacement part for the McDonnell & Miller FS8 W, this unit features a durable stainless steel #3 paddle configuration to ensure reliable contact closure once the system pump