What wiring fault would cause a remote control valve to fail to open?

• A. An open valve control wire
• B. A short circuit between the neutral wire and ground
• C. Current leakage to the earth from a valve control wire
• D. An open pump control circuit

Answer: (A)

A remote control valve only opens when its control circuit is complete and current reaches the valve’s solenoid. If the valve control wire is open, the circuit is broken, so no current can energize the solenoid. Without energizing the solenoid, the valve stays closed and won’t open.

Other faults don’t fit this direct cause as cleanly: a short between neutral and ground would typically trip protection or blow a fuse and cut power, not just leave the control path open. Current leakage to earth can cause nuisance alarms or instability but doesn’t necessarily prevent the control signal from energizing the valve. An open pump control circuit affects the pump circuit rather than the valve’s remote control line.