Symbio™ 700 - Unit Controller LED Legend

The Symbio 700 Unit Controller is equipped with several LED lights that serve as visual indicators for various functions and statuses. These LED lights play an essential role in helping users monitor and troubleshoot the unit. The Symbio 700 Unit Controller features multiple LEDs, each with a specific color and function. The system LED, for instance, typically emits green light when the unit is powered on, indicating proper operation.

Unit Controller LEDS

LED Description Notes

• The LEDs for the internal relays along the right-hand side of the Symbio 700 board illuminate
  a solid green color when the relay is energized. The description in the illustration has which
  output is active.
• LED 7 – Ethernet Activity light is for the Ethernet Port. The light will flash green whenever
  there is network traffic.
• LED 8 – Ethernet Link light is also for the Ethernet Port. The light will be solid yellow
  whenever the Symbio 700 board is connected to a router or network switch.
• LED 9 – System light is normally a solid light when power is applied and after the boot
  sequence.
• LED 10 – Alarm Status is normally off unless there is an active alarm then it will flash a red
  light.
• MODBUS TX/RX – Normally off unless the AHU is configured for SZVAV or multispeed.
  When normally communicating with the VFD, both lights will pulse at the same time with an irregular pattern
• IMC TX/RX – Normally has very fast pulsing almost making the lights look just dim.

Bluetooth

• LED 3 – Bluetooth is on when Bluetooth is connected and flashes during pairing, otherwise,
  it is off.

WARNING:

Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.