---
title: LED signaling
description: "| **Feature** | **Color** | **Explanation** | | --- | --- | --- | | Boiler | Green | **On**: Boiler demand active **Off:** Boiler demand inactive | | Pump | Green | **On**: pump demand active **Off**: pump demand…"
url: "https://faqdoc.info/en/systemauswahl/alpha-direct-en/alpha-direct-balance-switch-base-station-en/led-signaling/"
updated: "2026-09-29"
category: Alpha direct Balance Switch base station
---

# LED signaling

| **Feature** | **Color** | **Explanation** |
| --- | --- | --- |
| Boiler | Green | **On**: Boiler demand active **Off:** Boiler demand inactive |
| Pump | Green | **On**: pump demand active **Off**: pump demand inactive **Flashing**: Temperature limiter/dew point monitor active |
| Mains voltage | Green | **On:** Device in operation **Off**: Device out of service **Flashing:** Commissioning mode active |
| Fuse | Red | **On:** Fuse defective |
| Change over | Blue | **On:**Cooling mode active **Off:** Heating mode active |
| 8 room thermostats | Green | **On**: active thermostat signal, heating request **Off:** inactive thermostat signal, no heating request **Flashing (long – short)**: active thermostat signal, heating request, room is not currently participating in load balancing **Flashing (long – long)**: Display “Disable cooling” |
| Factory reset | Red | ower LED flashes red quickly for 5 sec, all other LEDs are off |
| FirstOpen Function | Green/Orange | Power LED flashes alternately green/orange + input LEDs are lighted during function; all other LEDs (pump, boiler, CO, etc.) as in normal mode |
| ManualOpen Function | Green/Orange | Power LED flashes alternately green/orange + CO LED flashes + all other LEDs (input LEDs pump, boiler, etc.) as in normal mode |