GE Appliances GDT645SYNFS dishes and flatware are not clean
Cause 1 of 5The Ultra-Fine Filter or the Fine Filter is clogged. Source: Troubleshooting Tips: Dishes and flatware not clean, p. 22
First checkClean the filters.
Causes and checks
The Ultra-Fine Filter or the Fine Filter is clogged. Source: Troubleshooting Tips: Dishes and flatware not clean, p. 22
- Clean the filters. See Clean the filters.
The inlet water is too cool. Source: Troubleshooting Tips: Dishes and flatware not clean, p. 22
- Run the hot tap nearest the dishwasher until the water stops getting warmer, then start the dishwasher and turn the tap off.
- Select the Boost option.
Water pressure is temporarily low. Source: Troubleshooting Tips: Dishes and flatware not clean, p. 22
- If a tap runs slower than usual, wait until the pressure is normal before running the dishwasher.
The air gap or disposer is clogged. Source: Troubleshooting Tips: Dishes and flatware not clean, p. 22
- Clean the air gap or flush the disposer. See Clean the air gap.
Large dishes block the detergent dispenser or the wash arms. Source: Troubleshooting Tips: Dishes and flatware not clean, p. 22
- Reload so nothing blocks the dispenser or the wash arms.
All 5 causes checked. Contact GE Appliances: 800.432.2737.
Service
If the checks above do not clear it, contact GE Appliances: 800.432.2737, geappliances.com/. United States, for service (general enquiries 800.626.2000). Canada: 800.561.3344. Source: Consumer Support, p. 26
Other GDT645SYNFS problems
- Dishwasher won't start or run4 causes in the manual. First: the Start sequence was not followed. The cycle starts only if the door is closed within 4 seconds of pressing Start.
- Controls respond but the dishwasher never fills with water3 causes in the manual. First: the door is not completely closed.
- Water left in the bottom of the tub or not pumping out2 causes in the manual. First: the air gap is clogged, or the drain loop or air gap was not installed as the installation instructions require.
- Dishes don't dry3 causes in the manual. First: the inlet water is too cool.
- Spots and film on glasses and flatware3 causes in the manual. First: extremely hard water, or the rinse agent dispenser is empty.
- White film on glassware, dishes and the tubA low-quality phosphate-free detergent is the likely cause of a white film on glassware, dishware and the interior. Hard-water minerals also leave a white film on the tub interior.
- Glassware is cloudy and the cloudiness does not wash offEtching, which is permanent. It comes from soft water combined with too much detergent, or from inlet water above 150 °F.
- Suds in the tub2 causes in the manual. First: the wrong detergent was used. Detergent not made for dishwashers fills the dishwasher with suds.
- Detergent is left in the dispenser cupDishes or utensils block the detergent cup or stop its door from opening.
- Control panel lights go off while setting the controlsMore than 30 seconds passed between pad presses. The display also turns off when the door stays open for two minutes.
- Black or gray marks on dishesAluminum utensils rubbed against the dishes.
Sources
- Owner's Manual, Dishwashers GD*565-665, DD*700 and PD*715-785 Series. GE Appliances, a Haier company. Document 49-4000270, revision Rev 0, 2022-07, 78 pages, en-US. images.salsify.com (PDF). Listed on the manufacturer's support page. Retrieved 13 November 2026.
- Quick Specs, GDT645SFN/SGN/SMN/SSN/SYN Stainless Steel Interior Dishwasher with Hidden Controls. GE Appliances. Document GDT645SFN/SGN/SMN/SSN/SYN, revision Specification revised 6/20, 2020-06, 2 pages, en-US. images.salsify.com (PDF). Listed on the manufacturer's support page. Retrieved 13 November 2026.
Page numbers are the numbers printed in the manual. Where this page and the manual differ, follow the manual.