Most “no-pump-out” issues will be solved by cleaning

out a plugged air gap, drain hose or disposer. However,

on GE dishwashers with a rear filter, “no-pump-out”

may also be caused by a malfunctioning piston and nut

assembly, located underneath the rear filter. To save

time, effort and repeat service calls, always inspect

the piston and nut assembly when diagnosing a

“no-pump-out“ complaint.

The piston and nut assembly has an integral check

valve, shaped like an umbrella, which closes the

collection chamber inlet during pump out. If the

check valve is damaged, held open by debris or

assembled upside down, water will circulate inside

the tub instead of going down the drain. Cleaning a

clogged valve or replacing a defective one will solve

the problem. The part number is WD24X10018.

If the piston and nut assembly is functioning normally,

verify operation of other parts of the drain system. As

a reminder, those parts include the dual pump check

valve on models with a three port collection chamber,

the adapter check valve at the outlet of the collection

chamber, the solenoid/gate valve mechanism on the

main pump and both the main pump and dual pump,

if equipped.