OpenQuatt Controller
The power changed
OpenQuatt
Your heat pump, live and local — no cloud required
OpenQuatt connects Homey Pro directly to the OpenQuatt heat pump controller on your own network. The controller is discovered automatically and all data arrives in real time over a live local connection — no polling and no cloud account needed. Monitor supply, return, outside and room temperatures, the supply target, power consumption, the active control mode and the aux relay, and switch manual cooling or the relay straight from Homey.
Automate everything with an extensive set of Flow cards for heating, cooling, faults, defrosting, the boiler, silent mode and the water flow, and feed the dew point from your own room sensors so the controller can cool safely without condensation. Two dashboard widgets: a status card with live temperatures, power, efficiency and status at a glance, and a heat pump card that shows each outdoor unit up close, with its compressor, fan, water temperatures and flow. Away from home, an optional read-only page shows the controller through your Homey's cloud connection, signed in with a login you set in the device settings. Requires a Quatt heat pump running the OpenQuatt firmware and a Homey Pro (Early 2023 or newer). This app is a community project and is not affiliated with Quatt B.V.
Supported devices
Flow cards
Click on a device above to show related Flow cards only.
When...
OpenQuatt Controller
The control mode changed
OpenQuatt Controller
Cooling started
OpenQuatt Controller
Cooling stopped
OpenQuatt Controller
Heating started
OpenQuatt Controller
Heating stopped
OpenQuatt Controller
A fault was detected
OpenQuatt Controller
The fault was resolved
OpenQuatt Controller
Defrosting started
OpenQuatt Controller
Defrosting stopped
OpenQuatt Controller
The boiler turned on
OpenQuatt Controller
The boiler turned off
OpenQuatt Controller
Silent mode turned on
OpenQuatt Controller
Silent mode turned off
OpenQuatt Controller
The dew point became available
OpenQuatt Controller
The dew point was lost
Without a valid dew point the controller blocks or limits cooling, depending on its configuration.
OpenQuatt Controller
The water flow changed
OpenQuatt Controller
The water flow rose above Water flow (L/h) L/h
Fires once when the flow crosses the value, not on every reading above it.
OpenQuatt Controller
The water flow dropped below Water flow (L/h) L/h
Fires once when the flow crosses the value, not on every reading below it.
And...
OpenQuatt Controller
Is cooling
OpenQuatt Controller
Is heating
OpenQuatt Controller
A fault is active
OpenQuatt Controller
Is defrosting
OpenQuatt Controller
The boiler is active
OpenQuatt Controller
Silent mode is active
OpenQuatt Controller
A dew point is available
OpenQuatt Controller
Cooling is permitted
OpenQuatt Controller
The aux relay (R2) function is ...
OpenQuatt Controller
The heating permission source is ...
OpenQuatt Controller
The room temperature source is ...
OpenQuatt Controller
The heating strategy is ...
OpenQuatt Controller
The water flow is above Water flow (L/h) L/h
Then...
OpenQuatt Controller
Set silent mode override to ...
OpenQuatt Controller
Force control mode ...
A forced mode blocks normal heating and cooling until you switch back to Automatic.
OpenQuatt Controller
Set boiler assist ...
Turning this off also disables the boiler fallback on heat-pump faults.
OpenQuatt Controller
Set OpenQuatt control ...
Off disables the entire OpenQuatt control loop.
OpenQuatt Controller
Set manual cooling enable ...
OpenQuatt's manual cooling override, which forces cooling permission regardless of the selected source. To feed the regular permission signal from Homey, use “Set cooling permission” instead.
OpenQuatt Controller
Set the aux relay (R2) function to ...
Chooses what the R2 relay follows. Pick External control to switch it yourself with the Switch the aux relay (R2) card.
OpenQuatt Controller
Send dew point Dew point (°C) °C to the controller
Sent straight to the controller (firmware with API input support; MQTT as fallback via the device settings). The last value is re-sent every minute until it expires.
OpenQuatt Controller
Update the dew point for Living room from temperature Temperature (°C) °C and humidity Humidity (%) %
Calculates the room's dew point from temperature and relative humidity; the highest recently updated room is sent straight to the controller (firmware with API input support; MQTT as fallback via the device settings).
Advanced
OpenQuatt Controller
Send outside temperature Outside temperature (°C) °C to the controller
Sent straight to the controller (firmware with API input support; MQTT as fallback via the device settings). The last value is re-sent every minute until it expires. Pick the source in the OpenQuatt web app under Settings → Sources / integrations → Sensor selection.
OpenQuatt Controller
Send room temperature Room temperature (°C) °C to the controller
Sent straight to the controller (firmware with API input support; MQTT as fallback via the device settings). The last value is re-sent every minute until it expires. Pick the source in the OpenQuatt web app under Settings → Sources / integrations → Sensor selection.
OpenQuatt Controller
Send room setpoint Setpoint (°C) °C to the controller
Sent straight to the controller (firmware with API input support; MQTT as fallback via the device settings). The controller keeps this value until you send a new one; the app re-sends it every minute and after a restart. Pick the source in the OpenQuatt web app under Settings → Sources / integrations → Sensor selection.
OpenQuatt Controller
Send supply target Supply target (°C) °C to the controller
Requires OpenQuatt firmware with external supply target support. Replaces the controller's own heating curve target, room correction included; its water temperature limits and heat pump control stay its own. Sent via API input (or MQTT from the device settings) and re-sent every minute until you send a new value or hand it back to the heating curve. After an app restart the controller returns to its heating curve. Select API input or MQTT under Supply target (heating curve) in the OpenQuatt web app.
OpenQuatt Controller
Hand the supply target back to the heating curve
Stops sending the supply target. The controller returns to its own heating curve once the last value has expired, within 15 minutes.
OpenQuatt Controller
Send heating curve offset Heating curve offset (°C) °C to the controller
Requires OpenQuatt firmware with heating curve offset support. This adjusts the local heating curve, not the supply target. Sent via API input (or MQTT from the device settings) and re-sent every minute until you send a new value; send 0 to clear it. After an app restart the offset lapses to 0. Select API input or MQTT under Heating curve offset in the OpenQuatt web app.
OpenQuatt Controller
Set heating permission ...
Tells the controller whether heating is allowed at all. Only counts while the heating permission source is API input (Homey), or MQTT for the fallback: set that with the Set the heating permission source card or on the device. Sent straight to the controller (firmware with API input support; MQTT as fallback via the device settings). The controller keeps this value until you send a new one; the app re-sends it every minute and after a restart.
OpenQuatt Controller
Set the heating permission source to ...
Chooses what decides whether the controller may heat. Not used drops that gate: the heating strategy then decides by itself when heat is needed, so a thermostat switching its heat demand on and off no longer starts and stops the heat pump. Pick API input (Homey) to give or withhold permission yourself with the Set heating permission card.
OpenQuatt Controller
Set the room temperature source to ...
Chooses where the controller takes the room temperature from. Pick API input (Homey) to feed it from another sensor with the Send the room temperature to the controller card. Power House stops heating while the chosen source has no fresh value, and the app stops re-sending a value after the maximum age in the device settings, so keep a flow sending it. The room setpoint keeps its own source, and the heating permission source and the strategy stay as they are.
OpenQuatt Controller
Set the heating strategy to ...
Switches only the heating strategy. The heating permission source, the heating curve points and the Power House settings stay as they are. The card waits until the controller reports the new strategy and fails if that takes longer than 15 seconds. Asking for the strategy that already runs changes nothing.
OpenQuatt Controller
Set extended heating ..., stop Stop margin (°C) °C above the setpoint and heat again after Cooling after stopping (°C) °C of cooling
Only counts while Power House runs. When the house needs less than the heat pump's minimum output, a running heat pump keeps heating at that minimum until the room reaches the setpoint plus the stop margin. It heats again once the room has cooled the given amount below that stop temperature, but never lower than the normal start point (the setpoint minus Power House comfort below setpoint), so a larger cooling restarts there. Example: setpoint 20, stop margin 1.0 and cooling 1.1 heat from 19.9 to 21.0. The controller keeps both values, also while extended heating is off. The heating strategy and the heating permission source stay as they are.
OpenQuatt Controller
Set cooling permission ...
Tells the controller whether cooling is allowed at all. Sent straight to the controller (firmware with API input support; MQTT as fallback via the device settings). The controller keeps this value until you send a new one; the app re-sends it every minute and after a restart. Pick the source in the OpenQuatt web app under Settings → Sources / integrations → Sensor selection. This is the regular permission signal, not the manual cooling override.
OpenQuatt Controller
Switch the aux relay (R2) ...
Switches the R2 contact itself. Only works while the aux relay function is set to External control.
OpenQuatt Controller
Set the aux relay temperature hysteresis to Hysteresis (°C) °C
Counts when the aux relay (R2) waits for the supply temperature, and for a run-on that lasts until the supply temperature. The relay switches on at its heating start temperature and off again once the supply is this much lower. A larger value keeps the relay on through the short dip of cold water at a quick restart. Only this setting changes. The card reads the value back and fails if the controller does not report it.
Widgets
Support
Having an issue with this app? Contact the developer via the developer website.
What’s new
Version 1.21.0 — New flow card to set the temperature hysteresis of the aux relay (R2). A larger value keeps a relay that waits for the supply temperature from switching off on the short dip of cold water at a quick restart.
OpenQuatt
OpenQuatt is not compatible with the selected Homey.
OpenQuatt will install on Homey shortly.
Changelog
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