Maybe it would help to have a sticky for troubleshooting to give people a checklist to go through to assist tech support. Something like the following.
To help troubleshoot a problem, please provide the following information:
1. Has the operation changed, or is this the first time attempting something new?
2. Please provide all of your front panel settings, as well as gas or air settings, along with any information displayed.
3. If this is a multi-process machine please try all the other processes and report what works and what doesn't.
4. For TIG units please try with and without the foot pedal in the 2T position.
5. Please check and adjust point gap, if applicable.
6. Check operation in both AC, and DC, if applicable.
7. Check operation with lift arc or scratch start TIG, if applicable.
8. Check all cables and connectors, and be sure work clamp is attached to the work directly.
9. Check torch is assembled properly, and compare all parts to the diagram, especially o-rings and swirl rings.
10. Please check with baseline settings, ( pulse off, all controls zeroed except the following: Amps 50, AC Freq. 100, AC Bal. 35%, Postflow 5 sec, 2T, HF on, check both AC and DC) as an example.
Long arc, short arc, heliarc and in-the-dark!