I didn't read the manual carefully enough and mixed two different types of detergent in my GE dishwasher. This is the one that you can put a whole bottle of detergent into. The detergent gelled and gummed up the system. I've purchased a new pump and replacement looks pretty straight forward. I wanted to remove the resevoir to get it thouroughly cleaned, but can't seem to figure out how to do that. Any suggestions?

Consumer Purge Cycle
The consumer must enter Service Mode to activate
the purge cycle. The purge cycle fi lls the dishwasher
for 57 seconds, then energizes the dispenser pump
(instead of the main motor) continuously to drain
the bulk dispenser tank .
The purge cycle deselects all other options and
runs for 65 minutes. The consumer should run the
purge cycle 3 times, filling the dispenser tank with
water for the second and third cycles. Total time is
approximately 3 hours.
Follow these steps carefully to have a successful
purge run.
For Front Mount Controls (PDW8900 series dishwashers)

For Top Mount Controls (PDW9700, PDW9900 series dishwashers)

For Front mount controls (PDW8600 series dishwashers, pay attention to step 3. Press added heat pad and cookware!!!!
1.
Make sure Pre-wash, Added Heat, and Heated
Dry LEDs are off.
2.
Press Heated Dry pad and Cookware pad
(down arrow pad on Top Mount Control models)
together for 3 seconds. All LEDs illuminate.
3.
Press Added Heat pad and Normal pad (up
arrow pad on Top Mount Control models)
together for 3 seconds. The Anti-bacterial LED
illuminates.
For PDW 8600 series Press added heat pad and cookware(up arrow pad on top mount control models)
4.
Press Start pad one time.
5.
Press Normal Wash pad and make sure Prewash,
Added Heat and Heated Dry LEDs are off.
6.
Press Start pad. Dishwasher will run a complete
cycle without the main motor running. Cycle is
complete when the clean light illuminates. This
should take approximately 60 minutes.
7.
Open door and wipe up the excess detergent
from the door and tub.
8.
Pour water on the door and tub where there is
detergent residue.
9.
Remove SmartDispenseTM cap and fill tank with
water. Replace cap.
10. Repeat steps 1 through 9 one time.
11. Repeat steps 1 through 6. When the Clean LED
illuminates, the system is purged and ready to
be refilled with the correct detergent.
– 18 –

In the sequence you provided steps 1&2 went as described and all LEDs illuminated. At step 3, after pressing Added Heat and Normal for 3 seconds the Anti-Bacterial light did not come on, but a motor started running. It wasn't the dispenser motor though, it was under the DW. The directions you provided say they're for front-mount controls on a PDW8900 dw. Mine is a PDW8680 with front-mounted controls. Could there be a different sequence?

Those instructions are universal for all smartdispense dishwashers, straight from the Tech manual, let me look into it a bit more. It could be that in step 3 you did not push them together, I know if you push one just ahaed of the other it wont work.

Did you continue the instructions after step 3 or did you stop?