How do I know if my 20/15 MFD capacitor has failed

How do I verify the span adjustment

While primarily a York/Johnson Controls part

Specifically designed for Amana

When should this part be replaced

Amana-Goodman B1370115 Limit Switch How do I know ifThe Amana Goodman B1370115 Limit Switch is a critical genuine OEM replacement part engineered for precise thermal protection in residential furnace applications. This 115 150F auto reset limit switch acts as a primary safety control, monitoring the internal plenum temperature to prevent heat exchanger damage. When the temperature exceeds the 150F threshold, the internal bimetal disc opens the circuit to the gas valve, safely terminating the heating