Valve Not Opening When Commanded
Likely Cause
The relay channel is not delivering 12V DC to the solenoid coil, or the solenoid coil has failed.
How to Fix
- 1In the app, open the relay controller tile and verify the channel status shows 'Open' after tapping the control — if the channel shows 'Open' but the valve stays closed, the wiring or valve is the issue.
- 2Measure voltage at the relay channel COM and NO terminals with a multimeter — you should read 12V DC when the channel is energised.
- 3Listen for the solenoid click when the relay switches — no click means the relay is not switching or the solenoid coil is burnt.
- 4Disconnect the valve cable and measure resistance across the solenoid coil terminals — a healthy coil reads 20–60 Ω. An open circuit (OL) indicates a burnt coil.
- 5Check that the relay controller has 12V DC power at its input — no power means no channels can switch.
- 6Replace the solenoid coil or valve body if the coil reads open circuit.
Valve Not Closing Fully — Continuous Drip or Seep
Likely Cause
Debris lodged in the valve diaphragm or seat, or a worn diaphragm that no longer seals correctly.
How to Fix
- 1Isolate the upstream water supply and depressurise the line before opening the valve body.
- 2Remove the solenoid coil and unscrew the valve bonnet to expose the diaphragm.
- 3Inspect the diaphragm for small tears, holes, or deformation — replace the diaphragm if damaged.
- 4Clear any grit, sand, or debris from the valve seat and diaphragm orifice using clean water.
- 5Reassemble the valve and restore water supply — confirm the valve seals fully with the relay channel off.
- 6If leakage continues after diaphragm cleaning and replacement, replace the valve body.
Valve Chattering or Buzzing When Open
Likely Cause
Supply water pressure is below the valve's minimum operating pressure, or there is electrical interference on the 12V line.
How to Fix
- 1Verify the upstream water pressure is within the valve's operating range — solenoid valves require a minimum of 0.3 bar to hold the diaphragm open silently.
- 2Check the 12V DC supply voltage at the relay controller output — voltage below 10V can cause solenoid chatter.
- 3Inspect the 12V power adapter for overload — if other channels are simultaneously switching high-current loads, voltage may sag.
- 4Ensure the valve cable run is not routed alongside mains power cables — electromagnetic interference can cause coil buzz.
- 5If chattering persists at correct voltage and pressure, the solenoid coil may be aging — replace the coil.
Scheduled Irrigation Not Running
Likely Cause
The schedule was not saved correctly to the relay controller, or the controller lost its schedule during a firmware update or power failure.
How to Fix
- 1Open the relay controller in the app, tap Schedules, and confirm the schedule is listed with the correct time, duration, and days.
- 2Check the schedule is enabled — a greyed-out or toggled-off schedule will not run.
- 3Verify the relay controller has power and is online (green LED or 'Connected' status in app).
- 4Confirm the correct channel is assigned to the schedule — a schedule on channel 2 will not open the valve on channel 3.
- 5Delete and recreate the schedule if the stored data appears corrupted — the controller will accept the new schedule immediately.
- 6Schedules run on the controller's internal clock — ensure the controller time zone is set correctly under Device Settings → Time.
Guided Help Center
9:41
1
Open the HPzenAi app.
Step 1 / 8
Relay Controller Not Visible in the App
Likely Cause
The relay controller is not connected to the gateway via RS485, or the gateway has not yet completed an RS485 scan.
How to Fix
- 1Verify the relay controller has 12V DC power — check the power LED on the controller.
- 2Confirm RS485 A and B wires are not swapped — reversed polarity prevents detection.
- 3In the app, go to Gateway → RS485 Scan to manually trigger a new device search.
- 4Check that the relay controller RS485 address is unique — if two devices share address 1, neither will be detected reliably.
- 5Use a short test cable directly between the gateway and controller to rule out a cable fault before testing longer runs.
- 6If using Wi-Fi mode (stand-alone), confirm the controller is in setup mode (blue flashing LED) and follow the Wi-Fi Setup guide.
Hydraulic Valve Not Actuating
Likely Cause
The pilot solenoid is not receiving power, or the line pressure is outside the hydraulic valve's operating range.
How to Fix
- 1Confirm the pilot solenoid coil is wired to COM and NO on the relay channel — not to the main valve body terminals.
- 2Measure 12V DC across the pilot solenoid terminals when the relay channel is energised.
- 3Verify the upstream line pressure is between 0.5 and 16 bar — hydraulic valves will not actuate outside this range.
- 4Inspect the pilot solenoid strainer for debris blockage — clean the strainer screen if clogged.
- 5Ensure the hydraulic valve body is installed with the correct flow direction — check the arrow on the valve body.
- 6If the pilot solenoid clicks but the main valve body does not open, the main valve diaphragm or actuator requires service.
Manual Override Stuck — Valve Remains Open or Closed
Likely Cause
A manual override command was sent from the app and the next scheduled event has not yet fired to return the valve to automatic control.
How to Fix
- 1Open the relay controller tile in the app and check for a 'Manual' badge on the affected channel.
- 2Tap the channel and tap Resume Schedule to return the valve to automatic schedule control.
- 3If no schedule is assigned, manually close the valve by tapping the Close button in the app.
- 4Check that the app is connected to the internet — manual resume commands require connectivity.
- 5If the channel badge does not update after tapping Resume, power-cycle the relay controller and re-check the channel state.
Valve Opens Correctly But App Shows Wrong State
Likely Cause
The relay controller status has not synced to the cloud, typically due to a brief internet outage at the gateway.
How to Fix
- 1Pull down to refresh the device tile in the app — this triggers an immediate status poll.
- 2Check the gateway is online: Main Menu → Gateway — the status indicator should show 'Connected'.
- 3If the gateway went offline during a valve operation, the status may be stale — the gateway will sync the current state once reconnected.
- 4Restart the gateway from the app: Gateway → Settings → Restart, then re-check the valve channel state.
- 5If the problem recurs, check the gateway Wi-Fi signal strength and consider a Wi-Fi repeater or SIM-enabled gateway.
Guided Help Center
9:41
1
Open the HPzenAi app.
Step 1 / 7
Pressure Reducing Valve Not Holding Set Pressure
Likely Cause
The PRV adjustment screw setting has drifted, or the internal spring and seat require service.
How to Fix
- 1Install a downstream pressure gauge close to the PRV to measure actual downstream pressure.
- 2Turn the PRV adjustment screw clockwise to increase downstream pressure, counter-clockwise to decrease.
- 3Make small adjustments (quarter turns) and allow 30 seconds for pressure to stabilise before re-reading.
- 4If the PRV cannot hold pressure within the expected range after adjustment, inspect the seat and diaphragm for wear or debris.
- 5Flush the line upstream of the PRV to remove grit that may be lodging under the valve seat.
- 6Replace the PRV if the internal spring has lost tension or the seat is visibly eroded.
Valve Offline After Power Interruption
Likely Cause
The relay controller did not automatically re-establish its connection after power was restored.
How to Fix
- 1Wait 2–3 minutes after power restoration — the relay controller and gateway reconnect automatically.
- 2If the controller remains offline after 5 minutes, check the 12V DC supply voltage at the controller input.
- 3Restart the gateway from the app if the gateway itself shows offline.
- 4Any schedules stored on the controller continue to run locally even during gateway outages — valve operation is not affected by internet loss.
- 5If the controller is back online but schedules show the wrong next-run time, re-check the controller time zone under Device Settings → Time.