For dishes that are not clean on the GE Profile PDT785, GE's troubleshooting table lists nine causes: a clogged Ultra-Fine or Fine Filter, low inlet water temperature, temporarily low water pressure (normal is 20 to 120 psi), a clogged air gap or disposer, a high drain loop or missing air gap, improper rack loading that blocks the detergent dispenser or wash arms, poor performing detergent, an overloaded or improperly loaded dishwasher and too little detergent. The manual says no pre-rinsing of normal food soil is required, but hard soils, bones and leafy vegetables should be scraped off.
Differential
Likely causes of “GE dishwasher does not clean dishes”, and how to tell them apart
- 1
A clogged Ultra-Fine or Fine Filter
What separates it The dishes feel gritty and the wash performance has dropped because the Ultra Fine or Fine Filter is clogged
How to confirm Clean the filters; GE says every other month or more depending on use
- 2
Low inlet water temperature or low pressure
What separates it There is a grease film and dull dishes, and slow filling, because of low inlet water temperature or low pressure
How to confirm Let the hot tap run until hot and check pressure is 20 to 120 psi; select Boost
- 3
Improper loading blocking arms or the dispenser
What separates it Food remains where dishes shielded each other because improper loading blocks the arms or the dispenser
How to confirm Load as the Loading section shows, without blocking the wash arms or dispenser
- 4
Poor or too little detergent
What separates it There is residue and film after the cycle because of poor or too little detergent
How to confirm Use high quality detergent such as tablets or packets in the right amount
Before you touch a setting
Record this first — changing settings destroys the evidence
- Whether dishes feel gritty and when the filters were last cleaned
- The water temperature and the water pressure
- Which cycle and options you used and how the racks were loaded
Try in this order
0 of 5 completedClean the filters
ReversibleRemove the bottom rack, twist the Ultra-Fine Filter assembly counterclockwise and lift it out, rinse it with warm soapy water and a sponge. Lift the Fine Filter (mesh plate) out from under the two rear tabs, rinse it, and replace it under the tabs.
Check water temperature and pressure
ReversibleRun the hot tap nearest the dishwasher until the temperature stops rising, then start and turn off the faucet. Select Boost if available. Pressure should be 20 to 120 psi.
Load correctly
ReversibleScrape hard soils, bones, toothpicks and seeds, but do not pre-rinse normal soil. Make sure large dishware does not block the detergent dispenser or wash arms.
Use a good detergent in the right amount
ReversibleGE recommends high quality tablet or packet detergents such as Cascade Platinum ActionPacs or Finish Quantum, and says old or damp powder detergent is a cause.
Check the air gap and drain
ReversibleClean the air gap or flush the disposer, and check the drain loop or air gap is installed as the Installation Instructions show.
Model-specific
What is true of this model and not of its siblings
- Filters in the manual
- The Ultra-Fine Filter assembly may be 2-piece with an additional Filter Basket for food particles: twist the basket counterclockwise to unlock it, pull it out, discard food, rinse and replace it and twist it clockwise to lock. Scouring pads or brushes can scratch the Fine Filter, but a soft brush or sponge may be needed for hard water calcium deposits.
- Parts for this problem on the PDT785 (RepairClinic, 2026-09-21)
- user cleanable fine filter and basket asm, part number WD12X25995, at $27.56; add to cart vent fan motor genuine oem part # wd, part number WD01X25638, at $7.24; water valve, part number WD15X27703, at $30.94.
- Other models this page answers
- These steps also fit models PDT755, GDP665, GDT670, GDT650, GDF510.
Stop boundary
When this stops being a self-service repair
- !If dishes stay dirty after cleaning the filters, checking temperature and loading correctly, contact GE Appliances service
- !If the air gap or drain is clogged and the sink also drains slowly, call a plumber
Evidence ledger
Sources behind this answer
GE Appliances' own support articles for dishwashers; the article for this page is named in the page's notes.
GE's own page for the Profile PDT785 with its installation guide and specifications.
Parts and list prices as shown on RepairClinic's parts search for this model number on 2026-09-21.
Exact questions
Common questions
What water pressure is normal?+
The normal water pressure is 20 to 120 psi.
What water temperature is needed?+
At least 120 F (49 C) and not more than 150 F.
What does Temp Boost do?+
It raises the wash temperature to help clean heavily soiled dishes and adds 20 to 50 minutes.
Which cycle for pots?+
Heavy/Pots is for heavily soiled dishes and cookware with dried-on or baked-on soils.
Is the detergent important?+
Yes. Poor performing or old detergent is a listed cause.
Does a clogged air gap matter?+
Yes. A clogged air gap or disposer is a listed cause.