Confirms auxiliary/display section is alive.
Fault route
MIG200DL Fan Not Running But Display Normal Diagnostic
A fan-branch route for MIG200DL welders where display works but the cooling fan does not run.
Quick Answer
For MIG200DL fan not running while display is normal, split the bottom-board AC380V control-transformer supply, AC220V fan output and the fan itself.
- Normal display means the machine is not completely dead.
- Bottom-board CON6 should supply AC380V to the control transformer path.
- Bottom-board CON5 should supply AC220V to the fan path.
Use this page when
- Display is normal but fan does not rotate.
- CON5/CON6 fan and transformer supply paths can be checked.
- You need to separate bottom board output from fan failure.
Do not use this page when
- Display is also off.
- Fan runs but no output.
- Breaker trips immediately.
MIG200DL fan-not-running / display-normal route
Separate fan output supply from the fan motor.
Bottom board should output AC380V to control transformer supply path.
Bottom board should output AC220V to the cooling fan.
If AC220V is present at fan path, inspect or replace fan.
Fan-not-running evidence table
| Evidence point | Expected / abnormal evidence | Repair direction |
|---|---|---|
| Display status | Display normal while fan does not run. | Use fan branch route. |
| CON6 | Bottom board should output AC380V for control transformer supply. | If missing, inspect bottom board supply path. |
| CON5 | Bottom board should output AC220V for fan. | If missing, inspect bottom board fan output. |
| Fan motor | Fan supply present but fan does not run. | Replace fan or repair fan wiring. |