C220 LED status lights

The C220 receiver has an LED that indicates the operational status using various colours and blink rates.

In certain lighting conditions and with certain viewing angles, it can be difficult to determine the exact colours of the LED. There are also times when an LED pattern can map to multiple conditions. Using diagnostic mode (H212, S111) can be helpful in these situations.

LED colour	Description	Details
Steady frosty white	The receiver is operating properly and waiting for a radio link from a remote device.
Steady green	The controller has a radio link from a remote device.
Steady turquoise	For some applications, the LED colour changes from steady green to steady turquoise to show that the controller is matched with a remote and is being commanded to turn on an output aside from LOOP OUT.
Steady deep blue	The receiver is in match mode and is waiting for a remote device to match with it. Normal operation resumes after a device matches with it or after one minute if no device matches with it.
Quickly blinking green	An activated output is overloaded (the connected load is drawing too much current) The output is short-circuited to ground The current-controlled output I/O 16 has detected a solenoid with unusual inductance or resistance	This is a warning indicator. The controller will continue to operate, with the possible exception of an output that has excessive load or is shorted to ground.
Quickly blinking blue	A recently activated output was overloaded for long enough to trigger the over-temperature protection of the associated output driver.	The controller will continue to operate and the affected output will resume operation when the driver cools down sufficiently.
Slowly blinking turquoise	The controller has detected that its supply voltage is below 8.0 volts	The controller will attempt to continue operating but some outputs may not be available. The controller may restart itself if the voltage drops further (for example, due to turning on an output function connected to a load). Check the wiring or the machine's battery and charging system.
Quickly blinking turquoise	The controller has detected that its supply voltage exceeds 34.0 volts.	The controller has turned off its output functions and will resume operation when the supply voltage decreases to an acceptable level.
Alternating blue and red	The controller has detected power being fed back into one of its outputs and it's not a normal condition for that ouput to be powered externally in the machine involved The controller has detected that an internal power driver has failed in the active state	If the condition is transient, power-cycling the controller will restore it to operation.
Alternating green and red	The LOOP OUT signal has been short-circuited to the ground The controller has detected an internal fault in its safety loop (E-stop) system	If the condition is transient, power-cycling the controller will restore it to operation.
Quickly blinking violet	The controller has detected an internal error condition that prevents it from operating. This condition may occur temporarily after reprogramming the controller's firmware through the USB programming cable, in which case power-cycling the controller will return it to normal operation.	This condition can happen when the entry-level radio (ELR) board is receiving messages from the radio module, but (at least upon startup) the radio module is not receiving messages from the ELR board. This has been seen in production in C220s with ELR-CAN boards, by tilting the board in the mating cinch connector. It's possible that the radio module powers up but the ELR board is not fully running.
Quickly blinking orange	The controller can't communicate with its base ELR board The controller has detected an error with the pulse width modulation (PWM) driver chips	This condition can happen while updating the firmware of the base ELR board using a USB programming cable, in which case there is no reason for concern. This condition will clear by itself once the communications or PWM driver has returned to normal.
Steady violet	The controller's radio module isn't programmed The controller's radio module has failed	You may have to program or replace the radio module for the controller to operate.
Steady orange	The controller hasn't been assigned a radio key The controller has been programmed with an incorrect firmware image The controller is in USB programming mode, meaning that a positive voltage was present on its USB VBUS/CAN0 signal (pin H3) during power-up. For example, the controller is connected to a special C220 programming cable with the USB connector plugged into a computer.	You may have to configure or reprogram the controller.
Very slowly blinking red	The base ELR board is old (revision 1 or revision 2 with D37 and D38 installed) and can’t be operated with any of the modern firmware being delivered to customers today or in the future.	Revert to an older firmware version or replace the controller with a newer unit.
Steady red	The controller isn’t being fed power and ground properly. The power or ground wire(s) is loose or disconnected, or the 30-way connector is not completely mated (check the 1/4"" hexagonal-head securing screw). The base ELR board's processor isn’t programmed.	You must fix the wiring or programming problem for the controller to operate.