Miller Electric CST 250 - Manuel (Page 28)

OM-212 817 Page 24
5-3. Troubleshooting
1
2
1 Output LED (Blue)
2 High Temperature LED
(Yellow)
803 080
Trouble Possible Causes Remedy
No weld output; unit completely
inoperative.
Line disconnect switch open. Place line disconnect switch in On position (see Section
3-12).
Blown line fuse(s). Check and replace line fuse(s), if necessary, or reset
circuit breaker (see Section 3-12).
Improper input power connections. Check for proper input power connections (see Section
3-12).
No weld output.
Blue LED flashes continuously yellow
Line voltage too high or too low. Line voltage must be within ± 10%.
Blue LED flashes continuously, yellow
LED off. Unit not linked correctly. Check line voltage and link unit accordingly.
Unit needs to be reset. Cycle power switch off and back on again. If problem is not
corrected, contact nearest Factory Authorized Service
Agent.
No weld output.
Blue LED flashes 4 times repeatedly,
yellow LED off.
Voltage in excess of 100 V from an
external source across output studs.
Check and correct any external voltage sources.
No weld output.
Blue LED flashes 5 times repeatedly,
yellow LED off.
Short circuit across output studs. Check and correct any short circuit conditions.
Low weld output.
Blue LED flashes 2 times repeatedly,
yellow LED off.
Single phase rating exceeded (output
foldback due to excessive input current).
Reduce output to 200 amperes or less.
yellow LED off.
High output VA coupled with a low 230
voltage line (output foldback due to
excessive input current).
Check line voltage and weld settings.
No weld output.
Blue LED flashes 3 times repeatedly,
yellow LED off.
Remote trigger left on. Turn off remote trigger, wait approximately 5 seconds, and
restart operation.
No weld output.
Blue LED flashes 6 times repeatedly,
yellow LED off.
Internal component failure. Contact nearest Factory Authorized Service Agent.
No weld output.
Blue LED off, yellow LED on.
Unit overheated. Allow unit to cool.
No weld output.
Blue LED off, yellow LED flashes
continuously.
Thermistor failure. Have Factory Authorized Service Agent check thermistor.
Fan not operating. Blocked fan blade. Check and remove anything blocking fan blade movement.
Fan failure. Have Factory Authorized Service Agent check fan motor.