Job has a node restriction

Use SCHEDULE MODIFY JOB /NOCLUSTER_NODE

Load balancing turned off

Use SCHEDULE SET LOAD_BALANCE ON

Weighting factors set to 0

Check logicals and see system manager

Only one node has reasonable rating

Check ratings using SCHEDULE SHOW STATUS

Load Balance Group assigned to the job is empty

Add one or more nodes to the Load Balance Group or remove the Load Balance Group from the job

NSCHED$LBAL$WAIT_AVAIL_
NODE setting is incorrect

Check the logical and see system manager.