Fire and Water Alarm


You can implement fire and water detection into the Loxone system with little effort using the Fire and Water Alarm function block. In addition, smoke detectors, temperature sensors can also be used for fire detection.


This device is used to alert you if a fire breaks out in your Smart Home or if water leaks.

Loxone’s own products, such as Fire Detectors Air and Water Sensor Air, are automatically detected and used. External products can be connected to the inputs. Temperature sensors can also be used for fire detection.

In addition, music server zones, light control modules and automatic blinds blocks can be selected directly in the module for the acoustic alarming.


As with all function blocks, you can find and insert the Fire Alarm block by searching through the “F5” menu. Any Air enabled Smoke Detectors and Temperature Sensors or Tree Temperature Sensors can be integrated with the block by double clicking on the block. After this, simply tick the devices you want to include as sensors for the Fire Alarm. If you have already set up a Loxone Music Server within your configuration, Music Server Zones will also appear in this menu, allowing you to tick the zones you want to play the Fire Alarm siren in.

Loxone Fire Alarm Function Block Inside Linking To Other Blocks

Of course, other temperature sensors or smoke detectors may also be used. Smoke detectors are connected to the input Is and temperature sensors to the input AIt.

Water sensors can be connected to input Iw.

A siren can be connected to output Qh.

In the case of an alarm, the siren sound is played over the Music Server, the lighting flashes and the shading opens fully.



The “Last sensors” view shows the last triggered sensors. The number of these can be set in the properties of the block.

The alarm suppression can be activated in the settings via the visualization. With the help of the alarm suppression you can carry out service work with fire detectors / water sensors / etc without the alarm going off.

Further content

Arc Fault Detection

In compliance with wiring regulations all circuits must be protected by an RCD and appropriately rated MCB. However, this protective measure on it’s own won’t be able to identify fault arcs.

Fault arcs can be caused by unsafe or exposed contacts or damaged wiring or cable insulation. We therefore recommend that the electrical installation in a Loxone Smart Home also has external electrical fault detection equipment (e.g. arc fault detectors). As Loxone, we don’t sell Arc Fault Detection Devices (AFDD) but using such a component in a Loxone Smart Home is best practice.


When it comes to fire alarm systems, you can already connect a fire alarm switch to the digital input of a Miniserver or Extension to trigger alerts through a Loxone Smart Home in the event of a fire.

We’ve taken it a step further. Using AFDDs for fire protection has long been standard, if not mandatory in industrial installations. Even though a Loxone system is designed for domestic installations, our system can now specifically take a signal from an AFDD and trigger a fault arc notification. You’ll find a dedicated Input (If) in the Fire and Water Alarm Function Block.

Recommended hardware


Programming example

In this example, a warning light and a caller were also linked to Q1. The caller informs you about the alarm by telephone.

As soon as a smoke detector triggers or a temperature sensor exceeds the maximum temperature (parameter Tm), the pre-alarm is started and output Q1 is activated. The pre-alarm is a silent alarm, which means that the siren is not switched on at this time. If the alarm is not acknowledged via the app or a pulse to input C within a certain time (parameter Dm), the main alarm will start. The main alarm also activates the input Q2 as well as the siren.




AbbreviationSummaryDescriptionUnitValue Range
CAcknowledge AlarmAcknowledge AlarmDigital0/1
ChAcknowledge SirenSingle pulse turns the output Qh off, whilst preliminary and main alarm stay active Alarms in Lighting Controllers and Music Server Zones will be disabled.Digital0/1
IsAlarm input for smoke detectorsSingle pulse sets of alarm (smoke detectors)Digital0/1
IwAlarm input for water detectorsSingle pulse sets of alarm (water detectors)Digital0/1
IfInput for external electrical fault detection equipment (e.g. arc fault detector) triggers alternative alert icon in the user interfaceInput for external electrical fault detection equipment (e.g. arc fault detector) triggers alternative alert icon in the user interfaceDigital0/1
AItTemperature InputAnalogue Input – Non Tree or Air Temperature Sensors


AbbreviationDescriptionUnitValue Range
Q1Digital output for the pre alarmDigital0/1
Q2Digital output for the main alarmDigital0/1
QhDigital Output – Used for SirenDigital0/1
AQAnalogue Output indicating number of active detectors
QtDigital Output – ON when test mode is activeDigital0/1
TQText Output – Providing last triggered sensorTextText


AbbreviationSummaryDescriptionUnitValue Range
Remanence inputRemanence Input: If active, the block resumes its last state after a Miniserver restart.Digital0/1
DMain Alarm DelayDelay of the main alarm after preliminary alarm is sounded in secondss0…∞
TmMaximum TemperatureMaximum permitted Temperature for Temperature Sensors and Temperature Input If a linked temperature sensor exceeds this value, the alarm will be activated.º
DmMaximum Alarm DurationDefines how long the maximum duration of an Alarm may be. After this duration the main alarm and the alarm sounder are disabled. 0 = Unlimiteds0…∞
CaAutomatic alarm acknowledgmentAutomatic acknowledgement of the preliminary alarm if a maximum duration is specified If Ca = 1, the pre-alarm is also acknowledged when the maximum alarm duration is reachedDigital0/1
MsService modeParameter – When ON service mode is enabled and only Qt is activated in case of an alarm 0 = Service mode disabled 1 = Service mode enabled 1 Duration for which the alarm is suppressed (Timed Service Mode).s0…∞