Hobart Welding Products AIRFORCE OM-279 - Manuel (Page 24)

OM-279 Page 20
Trouble Remedy
Fan motor FM does not run; Power light
and Ready light both On. Have Factory Authorized Service Agent check fan motor connections.
Check input power, and check for proper input connections (see Sections 2-8 and 2-10).
Trouble lights not working. Have Factory Authorized Service Agent check safety control board PC1.