WeatherMatic 12000 Valve Leaks While Another Zone Runs

Diaphragm or Debris Prevents Full Closure

A WeatherMatic 12000 solenoid valve leaks (weeps) when a different zone is operating, stealing pressure.

Common Causes

• Torn or degraded diaphragm.
• Debris (sand, grit) preventing the diaphragm from sealing.

Repair

Open the valve, inspect the rubber diaphragm and seat, and clean any debris from the valve body. Replace the diaphragm if damaged.