Grant Aerona controller data: separate schedule, demand, and operating mode
A Grant Aerona controller can show a scheduled period, a heating or hot-water demand, and a day or night operating state. These are not interchangeable.
What this means
The calendar says when operation is allowed, demand says whether heating or hot water is being requested now, and day or night mode describes the active operating profile. A scheduled On period can therefore coexist with no demand, and an icon alone does not prove the outdoor unit is running.
Equipment and model context
Grant Aerona heat pumps using the Aerona Smart Controller or Aerona Remote Controller
- Aerona3 with Smart Controller
- Aerona3 with Remote Controller
- Aerona 290 with Smart Controller
Grant states that the Smart Controller supports Aerona3 and Aerona 290, while the Remote Controller is for Aerona3. Their screens and menu paths differ, so identify the controller before following an icon guide.
What this guide covers
- The controller schedule is On but the heat pump is quiet, or a demand icon does not match the expected day or night setting.
What changes the answer
- A schedule grants a time window; the room, water cylinder, and control temperatures still decide whether heat is requested inside that window.
- Domestic-hot-water priority can pause space-heating output while the cylinder circuit is being served.
The schedule opens an operating window. A room or cylinder then creates demand, the controller selects a profile, and the heat pump plus valves attempt to deliver it.
- SchedulePermits operation at this time
- Circuit demandRequests heating or hot water
- Control profileApplies day, night, or work mode
- Plant responseOutdoor unit and valves deliver heat
| Screen evidence | Question answered | What to check next |
|---|---|---|
| Heating and DHW schedule | Is this service allowed now? | Current circuit demand |
| Demand or circuit status | Is heat requested for that circuit? | Target and measured temperature |
| Day or night indication | Which operating profile is active? | Profile settings and schedule transition |
| DHW priority | Is cylinder heating taking precedence? | Cylinder target and valve status |
Build a controller snapshot before changing a setpoint
Photograph the home screen, then record outdoor temperature, heating target, measured room or circuit value, domestic-hot-water target, schedule block, and day or night icon. Grant's performance-data guidance uses these fields together because each describes a different control decision.
Next watch one transition without altering installer parameters. A schedule boundary, a room reaching target, or a cylinder demand beginning can explain why icons and outdoor operation change. A single still image cannot show which state arrived first.
Include the time shown by the controller in the photograph. A clock error moves schedule boundaries while every programmed period still looks correct on its own screen. Correcting that time relationship can explain an apparent schedule miss without changing heating temperatures.
If the cylinder has priority, compare its measured value with its target before expecting radiator flow. The controller may be completing a legitimate hot-water request. A valve or sensor fault remains possible, but the demand order must be established before either part is blamed.
Controller identity sets the safe menu boundary
The Smart Controller and Remote Controller are not two names for the same interface. The Smart Controller spans Aerona3 and Aerona 290, while Grant limits the Remote Controller to Aerona3. Menu labels, hardware connections, and accessible data follow that pairing.
Remain in user-level status and schedule screens. Heating curves, hysteresis, valve allocation, additional-heater configuration, and installer access change system behavior and should stay with the commissioning engineer. If a fault icon appears, preserve it and use the separate controller-fault guide rather than clearing the state first.
Questions people ask about this
Why is a Grant schedule On while the heat pump is off?
The schedule permits operation but does not create demand by itself. A circuit at target can remain idle inside an enabled period.
Can hot-water priority pause the radiators?
Yes. The documented Smart Controller arrangements can give domestic-hot-water demand priority while space-heating valves are closed.
Do Aerona Smart and Remote Controllers use the same menus?
No. Grant treats them as distinct controls. The Smart Controller supports Aerona3 and Aerona 290, while the Remote Controller is specified for Aerona3.
Evidence recordHow this page was checked
official manufacturer support article, operation manual · checked 2026-09-03
Every technical claim above was written from primary documentation held in the HVAC Bench evidence record: Grant UK technical literature. Where a source limits a definition to certain models, test conditions, or product classes, that limit is repeated here rather than generalised.
- Documentation class
- official manufacturer support article, operation manual
- Scope of the definition
- Grant Aerona heat pumps using the Aerona Smart Controller or Aerona Remote Controller
- Last checked
- 2026-09-03