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In the event of a failure of the machine, contact an authorized service agent. The following operation
requires sufficient professional knowledge on electric aspects and comprehensive safety
knowledge. Make sure the input cable of the machine is disconnected from the electricity supply
and wait for 5 minutes before removing the machine covers Before taking your unit for servicing,
check the list below.
Symptom Solution
The overheat LED is on.
1. Check the welding current and welding time. Refer to the manual, and operate
according to the specification.
2. Check the running status of the fan when welding. If the fan does not work, and power supply is
normal, check the fan; if the power supply is abnormal, check the connecting cable of the power
supply.
3. Replace the thermal switch if it is damaged or faulty.
The power LED is off, and there is no output current.
1.
Check if the fan works. If it does not work, it indicates that the power supply is not present.
Check any fuses cables and supply switches.
2. If the fan works, it indicates that the PCB inside the machine may be defective.
The wire feeder feeds wire when operating the torch trigger,but there is no output current,
and the protection LED is off.
1.
Check if the ground clamp is properly connected, or if it is in good condition.(Page 9-10)
2. Check if the quick plug is connected to correct terminal.
3.
Check the welding torch for damage.
4.The PCB inside the machine may be defective.
Welding can be carried out when pushing the torch trigger, but the voltage cannot be adjusted.
1. Check if the voltage feedback wire inside the machine is in good condition.
2.
PCB inside the machine may be defective.
Welding current is unstable.
1.
Check the pressure arm on the wire feeder see if it’s locked properly.
2. Check if the wire feeding wheel matches the wire size(0.8mm-1.0mm)
3. Check the contact tip of the welding torch see if it’s stuck or worn. If so, replace a new one.
4. Check if the welding wire was badly bent or stuck.( cut off the bent wire and reset the wire feeder)
5. Check if the quick plug is loose.
*We highly value our customer’s opinion, If you had any problem using our MIG-140M MIG Welder,
please contact us on Amazon or visit our website.
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