Kemppi Minarc Tig MLP Machine Parts FAQs
Spare circuit cards, switches, grills, cables and couplings for a TIG inverter welder, and how to work out the right one for your machine.
What are the parts of an inverter TIG welder that most often need replacing?
Usually it is the parts that are handled, exposed to dust or moved: front panel switches and potentiometers, gas and cable couplings, cooling fans, rear grills and inlet rings, and internal ribbon cables and connectors. Electronic cards can also fail, but they are normally replaced only after the simpler causes have been ruled out.
Wear tends to show as intermittent controls, loose or leaking connections, a noisy or slow fan, cracked casings or overheating warnings. The cause depends on the machine and how it is used, so the manual's fault-finding section is the right starting point.
Can I fit a replacement circuit card myself?
Only if you are competent to work on electrical equipment and the maker's instructions allow it. A welding power source contains mains-connected parts and stored energy, and the HSE says people doing electrical work must be competent for the task. If you are not sure, have a competent person or the maker's service agent do it.
Before ordering, confirm the card is the correct type and revision for your machine, because a card that fits physically may still be wrong. Keep the old card until the machine is working properly again.
Why do I have to unplug the welder and wait before opening the case?
Opening a live or recently used machine is dangerous. HSE guidance says equipment should be made dead and proved dead before work starts, and that isolation should prevent anyone re-energising it by accident. Unplug the machine from the mains and keep the plug under your control while you work.
Inverter machines also contain capacitors that can hold a charge after switch-off. The waiting time and any discharge procedure depend on the machine, so follow the maker's service instructions. Do not assume a short wait is enough.
My welder keeps cutting out with an overheat light. Is it a fan or card fault?
Not necessarily. Overheat protection normally trips when the duty cycle is exceeded, the vents are blocked or the room is very warm, and it usually resets once the machine cools. Let it cool with the fan running, clear the vents and try a lower output or longer rests.
If it trips even after a long rest, the cause may be a worn or blocked fan, a poor internal connection or a faulty card. Duty cycle and fault codes are model-specific, so check the manual, and have an internal fault checked by a competent person.