Miller XMT 304 (help-5)

[clayrock]

While welding yesterday my machine brought up the code help-5 (right side of unit over heated), I didn't hear the fan come on. I cut the power to the unit for a bit then powered it back up and let it stand in stick mode as the fan used to kick in every 4-5 min and it didn't, in the 4-5 min the help-5 code did come up on the display again.
What can I try or what should I look at to try and troubleshoot this problem?

Thanks,

[cruizer]

Blown IGBT under the right side interconnect board. Likely cracked, also blown protection diode. IGBT's have to be replaced as a set, from Miller. The protection diode can be replaced from Digikey.