Status and alarms
Every indicator, alarm and warning the product can show, what it means, what usually caused it, and what to do about it.
This page lists every indicator, alarm and warning the product can show, what it means, what usually caused it, and what to do about it.
Board indicators
The names below are the names in the design data. On the board, each LED is marked with its reference designator.
| Indicator | What it means | Likely cause | What to do |
|---|---|---|---|
5V LED (D3) | The 5 V rail is present | — | If it is off, the board is not powered or the mains supply has failed |
5V LED (D38) | The isolated 5 V rail is present | — | If it is off, the isolated analogue front end has no power; check the isolated supply |
Alarm LED (D19) | The alarm relay output is active | At least one alarm is active | Look at the alarm list on the screen or in the web interface |
Status LED (D20) | The status relay output is active | The unit is running | No action |
AUX1 LED (D21) | Auxiliary output 1 is active | An alarm in the Aux 1 mask is active | Check the Aux 1 alarm mask |
AUX2 LED (D22) | Auxiliary output 2 is active | An alarm in the Aux 2 mask is active | Check the Aux 2 alarm mask |
Klep1–Klep4, Klep5 LEDs | That output is being driven | The unit is humidifying, flushing, or the output is stuck | See the valve section of the web interface |
Motor LED (D45) | The motor output is being driven | The pump is running | See the pump row in the web interface |
| Ethernet yellow LED | The Ethernet link is up; it blinks with traffic | — | If it is off, the network cable or the switch port is the problem |
| Ethernet green LED | The link runs at 100 Mbit/s | — | Off means a 10 Mbit/s link or line isolation |
Screen indicators
| Indicator | Colour | Meaning |
|---|---|---|
Pump | green when running, grey when stopped | The pump is running |
K1–K4 | green when open, grey when closed | The corresponding atomisation valve is open |
Alarm | red when active, grey when not | At least one alarm is active |
Status | green when active, grey when not | The unit is running |
| The alarms button | red when an alarm is active, green when there is none | Opens the alarms screen |
Mode: Standby / Mode: Automatic / Mode: Test | The operating mode | |
Flushing... | A flush routine is running | |
Test function in progress | The unit is in test mode | |
Check device connection | The screen cannot reach the controller over its RS-485 link | |
Failed to read alarm history | The controller did not answer the history request | |
No alarm history available | The controller has no stored alarm history |
Screen banners
The banner under the mode panel explains why the unit is not humidifying.
| Banner | Meaning | What to do |
|---|---|---|
Output reduced due to Highlimit transmitter | The air leaving the unit is already too humid, so the output is being cut back | Check the humidity in the supply air. If it persists, check the high-limit transmitter |
Waiting: Airflow | No airflow signal | Check the wiring at J14 (Airflow) and that the fan is running |
Waiting: Hygrostat | No hygrostat signal | Check the wiring at J16 (HL_ONOFF) and the hygrostat itself |
Waiting: Master | The master enable input is not active | Check the wiring at J12 (MEn) and the master switch |
Waiting: Alarm <name> | An alarm is blocking the run | Acknowledge the alarm, see the table below |
Test function in progress | The unit is in test mode | It returns to Standby when the test duration is over |
Web interface indicators
| Indicator | Meaning |
|---|---|
System Status: Running / Standby | The unit is following the demand / it is not |
Valve controller: running / stopped | The demand controller is active / it is held off |
Motor temperature: Overheated / Normal | The motor thermistor has tripped |
Master enable: On / Off | The master enable input is active |
Hygrostat: Closed / Open | The hygrostat contact is closed / open |
Airflow: Present / Absent | The airflow input is active |
| Input Signal | Which demand source is selected: 0-10 V, 4-20 mA, On/Off, External demand register, Return humidity, 0-10 V or Return humidity, 4-20 mA |
Active Alarms: 0 | No alarm is active |
Web interface error message
| Message | Meaning | What to do |
|---|---|---|
Invalid input ignored: <field names> | One or more fields in the form could not be accepted. The other fields in the form were still saved | Correct the listed fields and press Save again |
Alarms
The names below are the names the screen shows. Each one is either transient — it describes a condition that is happening right now and clears by itself — or sticky — it stays until you acknowledge it.
| Alarm | Kind | What it means | Likely cause | What to do |
|---|---|---|---|---|
Water Temperature High | sticky | The water temperature stayed above the threshold for long enough | Hot water supply, or a hot ambient temperature | Fix the water supply, then reset the alarm |
Water Temperature Too High | transient | The water temperature is above the threshold right now | Hot water supply, or a hot ambient temperature | Check the water supply. The alarm clears by itself when the temperature drops |
Conductivity High | transient | The conductivity is above the threshold right now | Concentrated or dirty water | Check the water supply and the flushing interval |
Conductivity After Flush | sticky | The conductivity stayed above the threshold for long enough, or flapped too often | The water itself is too conductive; flushing cannot fix it | Change or treat the water supply, then reset the alarm |
Conductivity Sensor Fault | transient | The conductivity probe is not giving usable readings | The probe is disconnected, unpowered, or the probe wiring is wrong | Check the probe at J37 and the isolated supply |
Water Pressure Low | sticky | The inlet pressure stayed too low for long enough | A closed valve, a blocked filter, a dry tank, or a leak in the water supply | Check the water supply between the tank and the pump |
Inlet Pressure Too Low | transient | The inlet pressure is too low right now | Same as above | Same as above |
Water Pressure High | sticky | The pressure after the pump stayed too low for long enough | A blocked filter, an air lock, or a failing pump | Check the filter and the pump |
Pump Pressure Too Low | transient | The pressure after the pump is too low right now | Same as above | Same as above |
Motor Temperature High | transient | The motor has tripped its own thermistor | The pump is blocked, the motor is overloaded, or the ambient temperature is too high | Check the pump and the water flow. The alarm clears by itself when the motor cools down |
No Motor Drive | sticky | The pump is commanded on but the motor is not drawing current | The motor, its wiring, or the motor contactor is faulty | Check the motor and the wiring at J33 |
Board Temperature High | transient | The temperature inside the controller is at or above 65 °C | Poor ventilation, or a hot environment | Improve the airflow around the controller |
Water Leak Detected | sticky | The leak input has been triggered | Water is present, or the leak detector has tripped | Close the water supply and find the leak. The alarm never clears by itself — reset it once the leak is fixed |
Input Signal Error | sticky | The overvoltage input has been triggered | The demand input is carrying more than the allowed voltage | Check the demand signal source and its wiring |
Maintenance Required | sticky | The maintenance countdown has run out, or more than 2000 pump hours have passed since the last maintenance | The unit has been running for a long time without service | Carry out the maintenance, then acknowledge it (see below) |
Which alarms clear by themselves
| Clears automatically | Needs a manual reset |
|---|---|
Water Temperature Too High | Water Temperature High |
Conductivity High | Conductivity After Flush |
Conductivity Sensor Fault | Water Pressure Low |
Inlet Pressure Too Low | Water Pressure High |
Pump Pressure Too Low | Water Leak Detected |
Motor Temperature High | No Motor Drive |
Board Temperature High | Input Signal Error |
Maintenance Required (clears when the maintenance is acknowledged) |
Motor Temperature High, Board Temperature High and Conductivity Sensor Fault clear
themselves once the underlying condition goes away. The screen does not offer a reset
button for them, and neither does the web interface.
Which alarms offer a reset button
| Alarm | Screen | Web interface |
|---|---|---|
Water Temperature High | yes | yes |
Conductivity After Flush | yes | yes |
Water Pressure Low | yes | yes |
Water Pressure High | yes | yes |
Water Leak Detected | yes | yes |
No Motor Drive | yes | yes |
Maintenance Required | yes - Reset on that card means "maintenance performed" | no |
How an alarm becomes a permanent alarm
| Transient alarm | Becomes sticky after | After this many trips in one hour |
|---|---|---|
Water Temperature Too High → Water Temperature High | 2 minutes of continuous excess | 3 trips |
Conductivity High → Conductivity After Flush | 2 minutes of continuous excess | 3 trips |
Inlet Pressure Too Low → Water Pressure Low | 30 minutes of continuous excess | 10 trips |
Pump Pressure Too Low → Water Pressure High | 30 minutes of continuous excess | 10 trips |
The sticky alarm stays until somebody acknowledges it.
Acknowledging an alarm
- On the screen, open the alarms screen and press Reset next to the alarm.
- In the web interface, press Reset in the Active Alarms card.
- Over the fieldbus, write a bit mask to the
ALARM_RESETregister.
Acknowledging also clears the trip history behind the alarm, so a sensor that is still out of range will raise a fresh alarm rather than immediately latching again.
Maintenance acknowledgement
The Maintenance Required alarm is cleared by acknowledging the maintenance itself, which
also resets the pump-hours counter and restarts the one-year countdown.
- On the screen, open the alarms screen and press Reset on the
Maintenance Requiredcard. That button means "maintenance performed". - Over the fieldbus, write
1to theMAINTENANCEregister. - The web interface does not have a button for this; use the screen or the fieldbus.
Next steps
- Troubleshooting — symptom-by-symptom fixes.
- Concepts — how the alarms escalate and why.
- Hardware reference — what each LED is wired to.