LED status and states
Table 10: Status LEDs and description of LED states
LED label LED color Normal state Descriptions of LED states
POWER Green On Steady Off Steady = No power
On Steady = Power is supplied by primary voltage
FAULT Red Off Steady 2 blinks followed by long pause = Controller powered on in default state.
For more information about this default state, see Input and output wiring
validation .
Blink - 2 Hz = Download or startup in progress, not ready for normal
operation, SA Bus devices offline (such as netsensors)
Rapid blink = SA Bus communications issue
Off Steady = No faults
On Steady = Device fault or no application loaded
FC BUS Green Blink - 2 Hz Blink - 2 Hz = Data transmission (normal communication)
Off Steady = No data transmission (auto baud in progress)
On Steady = communication lost, waiting to join communication bus
SA BUS Green Blink - 2 Hz Blink - 2 Hz = Data transmission (normal communication)
Off Steady = No data transmission (N/A - auto baud not supported)
On Steady = Communication lost; waiting to join communication bus
FC EOL (CVM
models)
Amber Off (except on
terminating devices)
On Steady = EOL is active
Off Steady = EOL is not active
ETH-1 (CVE
models)
Green Off Off Steady = ETH-1 is not connected
Blinking = ETH-1 connected and communicating
ETH-2 (CVE
models)
Green Off Off Steady = ETH-2 is not connected
Blinking = ETH-2 connected and communicating
FAULT
and
SA BUS
Green
Red
Both blink six times in sequence = no valid firmware on the device
M4-CV Series VAV Box Controllers Installation Guide18
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