A Problem valve opening or Problem valve closing message means that the system expected the valve to reach a specific position, but did not receive the expected confirmation.

This does not always mean that the valve motor is defective. In many cases, the valve is able to move, but the supervision circuit does not confirm the open or closed position.

Before you start

Make sure you have:

• Access to the NOWA PRESENCE app or portal.
• Access to the control panel.
• Access to the valve wiring terminals.
• A small flathead screwdriver.
• A multimeter, if voltage must be verified.
• Photos of the valve wiring before making any changes.

The valve wiring is divided into two parts: power and supervision.

NOWA 4S / 4Se – Main automatic shutoff valve

• White wire: terminal 1 / COM
• Green wire: terminal 2 / C1
• Yellow wire: terminal 3 / O1
• Red wire: terminal 13 / +
• Black wire: terminal 14 / -

Main valve wiring diagram.

NOWA 4S – Auxiliary NOWA valve

For an auxiliary NOWA valve on a NOWA 4S panel, the supervision wires are connected to terminals 4, 5 and 6. The red and black power wires are connected to terminals 13 and 14.

• White wire: terminal 4 / COM
• Green wire: terminal 5 / C2
• Yellow wire: terminal 6 / O2
• Red wire: terminal 13 / +
• Black wire: terminal 14 / -

Auxiliary valve wiring diagram.

NOWA 4Se wiring note

In the valve settings, confirm the following:

• The Valve installation type matches the installed valve: Normally Closed or Normally Open.
• Valve supervision is enabled during normal operation.
• The Valve mode matches the installation.
• The Valve transition time is long enough for the valve type and size.

Single valve mode

Valve settings in single valve mode.

NOWA 4S – Dual valve independent mode

NOWA 4S valve settings in dual valve independent mode.

NOWA 4Se / 4S – Dual valve synchronized mode

Valve settings in dual valve synchronized mode.

When a Problem valve opening or Problem valve closing is active, the NOWA 4S / 4Se panel can display an advanced menu that allows you to force a valve rotation cycle.

1. Go to the control panel.

Menu button location on top of the NOWA 4S / 4Se control panel.

2. Press and hold the menu button on top of the control panel.
3. Wait until the Perform valves reinitialization menu appears.
4. Press the menu button once to reach the Perform the action menu.
5. Press the middle button to start the reset valve cycle.
6. The panel will ask for confirmation because the system is in alarm.
7. Select Yes to confirm.
8. The panel will try to power the valve on and off to force a full valve rotation cycle.

Perform valves reinitialization menu.

Confirmation screen shown while the system is in alarm.

Valve reinitialization in progress.

Observe the valve directly during the reset valve cycle and confirm whether it physically moves.

If the valve problem remains active and you cannot control the valve normally, temporarily disable supervision to test whether the valve motor can physically move.

1. Go to the valve settings.
2. Temporarily disable Valve supervision for the affected valve.
3. Cancel the valve alarm or trouble.
4. Send an open or close command to the valve.
5. Observe the valve directly.

Check the power wires

Confirm that the red and black wires are connected to the correct power terminals.

• The wires must be inserted into the correct terminals.
• The terminal screws must be tight.
• The screw must press on the metal conductor, not on the plastic insulation.
• The wire must not be loose or partially inserted.

Check the voltage delivered to the valve

The power delivered to the valve depends on the power source used to power the panel. The valve output voltage follows the panel power supply voltage.

Check if the valve needs to be powered longer

If a valve has not moved for a long period of time, it may need to be powered longer to start moving again.

• If the valve is configured as Normally Open, send a close command to power the valve.
• If the valve is configured as Normally Closed, send an open command to power the valve.

Check the manual override

If the manual override is active, the motor may not be able to control the valve properly. Return the valve to its normal motorized operating position, then test again.

Check the cable extension

If the original valve cable was extended, inspect the extension carefully.

• Wires touching each other.
• Poor splices or loose connectors.
• Cable damaged by staples.
• Cable pinched, crushed or cut.
• Wrong wire-to-wire connection.
• Moisture inside junction points.

If the valve physically opens and closes when supervision is disabled, the motor and power wiring are likely functional. Re-enable valve supervision and identify which confirmation is missing.

1. Enable Valve supervision again.
2. Send a close command and check if the closing confirmation is detected.
3. Send an open command and check if the opening confirmation is detected.
4. Note which confirmation fails: opening, closing, or both.

If both opening and closing do not confirm

• Confirm that the white wire is connected to the correct COM terminal.
• Confirm that the white wire is properly stripped.
• Confirm that the terminal screw is tightened on the metal conductor, not on the plastic insulation.
• Check for a loose wire or broken conductor.
• Check for a damaged cable extension.

If only opening or only closing does not confirm

If only one position does not confirm, the issue is usually related to the green or yellow supervision wire. The affected wire depends on whether the valve is configured as Normally Closed or Normally Open.

If the valve moves but the problem keeps returning, an advanced test can be performed by temporarily moving the valve wiring from the Main valve terminals to the Auxiliary valve terminals.

Purpose of this test

This test helps determine whether the problem follows the valve wiring or stays with the panel output.

• If the problem moves from the Main valve to the Auxiliary valve, the issue is more likely related to the valve wiring, supervision wiring, cable extension, or valve itself.
• If the problem does not move to the auxiliary output, the issue may be related to the main valve relay/output on the panel, or the wiring may have been reconnected more securely during the test.

Procedure

1. Take clear photos of the current Main valve wiring.
2. Move the valve wiring from the Main valve terminals to the Auxiliary valve terminals.
3. Adjust the valve supervision settings in the panel to match the new temporary auxiliary valve configuration.
4. Test the valve again by sending an open command and a close command.
5. Check if the valve problem now appears on the auxiliary valve instead of the main valve.

Interpret the result

Confirm by switching back

After testing the valve on the auxiliary output, move the wiring back to the original Main valve terminals and adjust the valve supervision settings back to the original configuration.

• If the problem returns to the Main valve, the issue is likely related to the main valve output or relay.
• If the problem does not return, the original issue may have been caused by a loose wire, poor terminal contact, or a wiring connection that was corrected during the test.

The valve transition time is the maximum time allowed for the valve to reach the expected position. If the transition time is too short, the panel may report a valve problem even if the valve is working normally.

After adjusting the transition time, test the valve again by sending an open command and a close command.

1. Cancel any active alarm or trouble.
2. Enable valve supervision.
3. Send a close command to the valve.
4. Confirm that the valve physically closes.
5. Confirm that the panel does not show Problem valve closing.
6. Send an open command to the valve.
7. Confirm that the valve physically opens.
8. Confirm that the panel does not show Problem valve opening.

Troubleshooting summary

Most common causes

Need assistance?

If the issue remains after completing the checks above, contact NOWA Technical Support.

Please provide the following information:

• Panel model: NOWA 4S or NOWA 4Se.
• Valve size and type.
• Whether the valve is configured as Normally Closed or Normally Open.
• Current valve transition time.
• Whether the valve physically moves when supervision is disabled.
• Whether the problem is on opening, closing, or both.
• Photos of the valve wiring terminals.
• Photos of any cable extensions or junctions.
• Exact message displayed by the panel or portal.