Which of the following could indicate that a solenoid valve is faulty?

Intermittent actuation is a strong indicator that a solenoid valve may be faulty. This could suggest that the valve is not consistently receiving power or that there may be a mechanical issue affecting its operation. A solenoid valve is designed to operate either fully open or fully closed, so erratic functioning can lead to unpredictable air flow and pressure levels, which can affect the overall system performance. This symptom often prompts further investigation into the electrical connections, the solenoid coil itself, or potential obstructions within the valve.

Continuous air output may indicate a constant leak or malfunction, while normal pressure readings do not inherently point to a problem with the solenoid valve. Absence of noise during operation can mean that the valve is not activating, but it is not as definitive as intermittent actuation for diagnosing a fault.