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NOTICE: In the period of guarantee maintenance, if user makes wrong check and repair for malfunction
of welding/cutting machines without our permission, the free maintenance guarantee offered will be invalid
TROUBLESHOOTING AND FAULT FINDING
Notes: The following operations must be performed by qualified electricians with valid certifications. Before
maintenance,please contact with us for professional suggestion.
Fault symptom Remedy
Power indicator is not lit, fan does
not work and no welding output
1. Power switch is out of work.
2. Check if electrify wire net (which is connected to input cable) is in work.
3. Check if input cable is out of circuit.
Power indicator is lit ,fan does not
work or revolve several circles ,no
welding output.
1. Maybe connect wrong to 380V power cause machine is in protection circuit,
connect to 220V power and operate machine again.
2. 220V power is not stable,(input cable is too slender)or input cable is connected to
electrify wire net cause machine is in protection circuit .Add the section of cable
and tighten input connector firmly .Turn off machine 2-3 minutes then turn on it
again.
3. Cable is loosed from switch to power panel, tighten them again.
4. Turn on and turn off power switch constantly in short time cause machine is in
protection circuit Turn off machine 2-3 minutes then turn on it again.
5. Main circuit 24V relay of power panel is not close or has damaged. Check 24V
power source and relay. If relay has damaged replace it with same model.
Fan is working, indicator is not lit
and sound of HF arc-striking can not
be heard, wiping welding can not
strike arc.
1. Positive and negative electrodes of VH-07 insert component voltage should be
about DC308v from power panel to MOS board.
2. There is a green indicator in auxiliary power of MOS board, if it is not on, auxiliary
power is out of work. Check fault spot and connect with seller.
3. Check if connector is poor contact.
4. Check control circuit and find out reasons or connect with seller.
5. Check if control cable of torch is broken.
Abnormal indicator is not on, sound
of HF arc-striking can be heard, but
there is no welding output.
1. Check if torch cable is broken.
2. Check if grounding cable is broken or not connected to welding piece.
3. Output terminal of positive electrode or torch electrify is loosed from
inner-machine.
Abnormal indicator is not lit, sound
of HF arc-striking can not be heard,
wiping welding can strike arc.
1. Primary cable of arc-striking transformer is not connected to power panel firmly,
tighten it again.
2. Arc-striking tip is oxidized or too far, give a good polish to it or change it is about
1 mm between arc-striking tip.
3. Switch (sticking/argon-arc welding) is damaged, replace it.
4. Some of HF arc-striking circuit components is damage, find out and replace it.
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