Error codes

What a robot’s error code means, from the maker’s own directory, with a link to the page where the maker says what to do about it.

Type the code from the teach pendant, or words from the message. Each directory is grouped the way the maker prints it: by robot generation, then by section.

Code or messageMakerApplies toSectionCause

1,223 codes from Universal Robots · page 3 of 31

C39A107 · Watchpoint fault: ROM-test task timeout

Universal Robots · CB3 and Earlier Models

C39 Logic and Temporal Monitoring Fault

C43A1 · Current sensor gain

Universal Robots · CB3 and Earlier Models

C43 Change in invariant memory detected

C44A0 · Base

Universal Robots · CB3 and Earlier Models

C44 CRC check failure on primary bus

C44A1 · Shoulder

Universal Robots · CB3 and Earlier Models

C44 CRC check failure on primary bus

C44A2 · Elbow

Universal Robots · CB3 and Earlier Models

C44 CRC check failure on primary bus

C44A3 · Wrist 1

Universal Robots · CB3 and Earlier Models

C44 CRC check failure on primary bus

C44A4 · Wrist 2

Universal Robots · CB3 and Earlier Models

C44 CRC check failure on primary bus

C44A5 · Wrist 3

Universal Robots · CB3 and Earlier Models

C44 CRC check failure on primary bus

C44A6 · Tool

Universal Robots · CB3 and Earlier Models

C44 CRC check failure on primary bus

C44A80 · CRC Check failure on primary bus.

Universal Robots · CB3 and Earlier Models

C44 CRC check failure on primary busCause given

C49A200 · Secondary RS485 bus is down

Universal Robots · CB3 and Earlier Models

C49 RS485 receive warningCause given

C50A1 · Voltage detected at 24V rail before startup

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A2 · Voltage present at unpowered robot

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A5 · Powersupply voltage too low

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A6 · Powersupply voltage too high

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A11 · Voltage not detected at 24V rail after startup

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A15 · Warning, waiting for SafetySYS2

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A16 · The Teach Pendant does not respond

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issueCause given

C50A17 · The Euromap67 interface does not respond

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issueCause given

C50A18 · Warning, waiting for SafetySYS1

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issueCause given

C50A19 · Warning, Waiting for a valid "euromap67 activated" status bit from secondary Safety Control Board

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A20 · 5V, 3V3 or ADC error (5V too high)

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A21 · 5V, 3V3 or ADC error (5V too low)

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A22 · Robot current sensor reading too high

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A23 · Robot current sensor reading too low

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A24 · 48V not present (Check internal connection)

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A25 · Robot voltage present at 48V PSU powereup

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A26 · Voltage present on unpowered 48V power supply

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A27 · 12V, 3V3 or ADC error (12V too high)

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A28 · 12V, 3V3 or ADC error (12V too low)

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A29 · Analog I/O error (-12V too high)

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A30 · Analog I/O error (-12V too low)

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A31 · The other safetySYS do not initialize

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A40 · Wrong voltage from PSU1

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A41 · Wrong voltage from PSU2

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A42 · Voltage will not disappear from PSU

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A43 · Warning, waiting for CB2 type answer from primary processor

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A50 · Processor A 3.3V supply voltage out of bounds

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A51 · Robot voltage below threshold

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

C50A52 · Robot voltage above threshold

Universal Robots · CB3 and Earlier Models

C50 Robot powerup issue

Universal Robots C39A107

Watchpoint fault: ROM-test task timeout

What to do: p. 21 of Universal Robots’s directory All Universal Robots codes

MakerUniversal Robots

Applies toCB3 and Earlier Models

SectionC39 Logic and Temporal Monitoring Fault

Page21

The directory gives no cause for this code; the maker’s notes on it are on page 21.

From Universal Robots’s own error code directory. The steps to fix it are the maker’s and are on the page linked above, not copied here.