The MPLAB® Snap In-Circuit Debugger/Programmer has two fixed color LEDs. The Active LED is green and the Status LED is yellow. The expected start-up LED sequence for the MPLAB Snap debugger is:
Green - steady on; Yellow - off. The debugger is ready.

The LEDs have the following significance.

Table 1: Normal Modes LED Descriptions

LED Color Description
Active, on Green Power is connected; debugger in standby.
Status, on (or pulsing activity) Yellow Debugger is busy; activity during an operation.

The following table provides LED descriptions for errors.

Table 2: Error LED Descriptions

Errors Description
Status, on 3 seconds Bootloader problem accessing he serial EEPROM.
Status, on 10 seconds API commands cannot be processed by the Bootloader.
Active and Status, fast blink (alternating) A runtime exception occurred in the tool firmware.
Active and Status, fast blink (in tandem) A runtime exception occurred in the Bootloader.
© 2024 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.