IBM 3274 User Manual page 95

Is the host powered on and operating without error?
Y N
007
I
006
When the host system problem is resolved, resume
operation.
Go to Procedure 14 on page 2-35.
Note: Perform problem determination prescribed by the 3-digit
nnn
code, using the 3270 Information Display System:
2-20
Reference Summary, GX20-JB7B-5 or higher, or the
display station problem determination guide (see
"Related Publications" on page iv of this guide for
publication order numbers).