often indicating the flame sensor is dirty or malfunctioning and cannot send a signal to the control board

check for high static pressure or undersized ductwork

ensuring the copper capillary remains protected

The assembly supports an extensive range of refrigerants

avoiding the mounting issues common with universal "fit-all" switches

Weil McLain 510-350-211 Delay Timer often indicating the flame sensorThe Weil McLain 510 350 211 Delay Timer is a critical solid state component designed to optimize burner ignition sequences in residential and commercial boiler systems. Engineered for a 2 1 2 minute delay on make, this 24 volt electrical delay timer prevents damaging short cycling by maintaining precise control over the duration between system calls and burner activation. For technicians servicing legacy Weil McLain CE boilers and electric furnaces,