Valves - Valve Not Opening

There are several reasons why a valve might not open. 

Insufficient Voltage

If the valve does not receive an appropriate level of voltage or the wire distance is too long, you may experience issues opening the valve.

  1. Check the voltage at the controller screw terminals for proper voltage of 24–28 VAC.
  2. Using the installed wire gauge size connected to the valve, review the maximum run in the chart compared to the actual install. For additional guidance, reference the wire sizing section here.
  3. If there are other valves within the box, swap the valve wires to a known operating valve to verify proper voltage.
Clogged Solenoid Exhaust Ports

There is an entry port from the valve upper chamber to the solenoid and an exhaust port from the solenoid to downstream in the valve. If either port gets clogged with debris, the valve may not open or open fully.

  1. Attempt to turn on the valve using the external bleed screw. If it turns on, there may be a port issue.
  2. Remove the solenoid (or Accu Sync assembly if installed).
  3. Insert a thin piece of metal or 18 AWG (0.8 mm2) station wire (small paperclip size) down the center port in the solenoid chamber.
  4. Insert the same piece down the side outlet port of the solenoid chamber.
  5. Re-thread the solenoid or Accu Sync assembly onto the valve bonnet.
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