Controller LEDs

The following table describes the LEDs for the MD Plus, MX, and MQ controllers.

Table: Controller LEDs
LED Correct Operating Condition Fault Indication Probable Cause Corrective Action
Green – Power On Off 1. System power is not supplied to unit. Possible line power problem. 1. Check supply power and connections.
2. Internal fault 2. Contact technical support.
Red – Error Off On (continuous) Internal fault Contact technical support.
On for one second followed by all LEDs on for five seconds. Unit went through RESET due to an unrecoverable software error. Contact customer support.
Flashing The controller is decommissioned. Commission the controller.
Green – Active On Off 1. Controller is a Standby. 1. None - Green Standby is on.
2. Controller not commissioned. 2. Commission controller.
3. Internal fault. 3. Contact technical support.
Flashing Controller is not configured. Download controller configuration.
Green – Standby Off On Controller is a Standby. None
Flashing Controller is not configured. Download controller configuration.
Yellow - Pri. CN Communications attempted and indicator flashing Off – Communications attempted and indicator not flashing. Controller lacks active Ethernet communications on primary Control Network connection. Check primary network cable connections and switch connections.
Yellow - Sec. CN Communications attempted and indicator flashing Off – Communications attempted and indicator not flashing. Controller lacks active Ethernet communications on secondary Control Network connection. Check secondary network cable connections and switch connections.