Miller Syncrowave 250 DX Technical Manual page 65

Trouble
One or both fan motors FM1 and FM2 do not run.
NOTE: Units have Fan-On-Demandt, and fans run
only when necessary.
Voltage and/or amperage meters not working properly. Check main control board PC1 and connections, and replace if necessary (see Section
Electronic equipment in welding area not working
properly.
Syncrowave 250 DX
Check and clear blocked fan blade(s).
Check coil voltage and connections of fan motors FM1 and FM2, and replace if necessary
(see Section 6-3).
6-6).
HF interference problem. Check for proper installation, and correct problem (see Section
8).
Remedy
TM-359 Page 61