Section 7 - Troubleshooting; Troubleshooting - Miller SRH-444 Manuel Du Propriétaire

7-1. Troubleshooting
Trouble
No weld output; unit completely
inoperative.
No weld output.
Unit provides only low or minimum weld
output.
Low weld amperage; Amperage
adjustment does not control amperage.
Maximum weld output only.
Erratic or improper weld output.
Excessive line current or line fuse(s)
open repeatedly.
Fan not operating and/or unit is
overheating.
When TIG welding, output current does
not match the Amperage Adjustment
control setting.

SECTION 7 - TROUBLESHOOTING

Place line disconnect switch in On position (see Section 4-14)
Check and replace line fuse(s), if necessary, or reset circuit breaker (see Section 4-13).
Check for proper input power connections (see Section 4-14).
Check for proper jumper link position (see Section 4-14A).
Check for open line fuse(s), and replace if necessary. Check and replace circuit breakers
Clean and tighten all weld connections (see Section 4-10).
Place Remote Amperage switch in correct position (see Section 5-2).
Have Factory Authorized Service Agent check Amperage Adjustment control.
Check for proper input power connections (see Section 4-14.
Check for proper input power connections (see Section 4-14).
Check for proper jumper link position (see Section 4-14A).
The amperage adjustment scale applies to the Stick process only. The scale does not apply
while using the TIG process. Actual output current is higher while using the TIG process.
Remedy
Clean and tighten all weld connections.
Check for proper line voltage.
(see Section 4-13B).
Select correct size weld cables (see Section 4-9).
Reset supplementary protector CB1 (see Section 6-2).
Clean and tighten all weld connections.
Use proper size and type electrodes.
Remove anything blocking fan movement.
Check fan motor, and replace if necessary.
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