I have a error code for a pump timeout on a ge stackable model gtup270em0ww How should I move forward with a repair?

SOURCE: GE stackable washer Model #wsm242od Won't spin. It

Check your lid switch for continuity. For a free video on this go to www.appliancehelponline.com/servicemanual.html

SOURCE: Hi, my ge washer/dryer model GTUP270EM0WW won't complete it's cycle for wash, rinse and spin even after resetting. Lights will be on with grinding sound still no progress

really hard to diagnose without being there. Maybe try these folks. They have a 877 help#,
Here's the link to their site and your unit.

http://www.appliancepartspros.com/repair-help/general-electric-washer-dryer-combo-gtup270em0ww-repair
hope this helps a little.