If the vacuum breaker is constantly weeping from the atmospheric vent or fails to close during pressurized flow

If the motor is seized or pulling high amps

The Danfoss 003N4411 is a high-performance WVFX 25 pressure operated water valve engineered for precise condensing pressure regulation in water-cooled refrigeration systems

and accidental physical damage

Trane SWT2979 Pressure Switch 318973-401 If the vacuum breaker isThe Trane SWT2979 Pressure Switch is a critical safety component designed for precise draft monitoring in high efficiency Trane and American Standard furnaces. As a OEM dual pressure switch, this part is the direct replacement for legacy part numbers BA20149 and C342634P62. This 2 stage air pressure switch features a dual diaphragm configuration engineered to sense specific vacuum thresholds: the high side is rated to open at 1. 93" W. C. and close at