GE GDT645SYNFS dishwasher
- Category
- Dishwashers
- Model number
- GDT645SYNFS
- Region
- United States
- Verified
- Rating label
- On the left or right front inside edge of the tub, or on the right side edge of the door. Source: support page
- Start light flashing
- Beeps once a minute
- Sanitized light not on
- Lock Controls light on
- LEAK DETECTED
- Dishwasher won't start or run
- Controls respond but the dishwasher never fills with water
- Water left in the bottom of the tub or not pumping out
- Dishes and flatware are not clean
- Dishes don't dry
- Spots and film on glasses and flatware
- White film on glassware, dishes and the tub
- Glassware is cloudy and the cloudiness does not wash off
- Suds in the tub
- Detergent is left in the dispenser cup
- Control panel lights go off while setting the controls
- Black or gray marks on dishes
- How to clean the filters
- How to clean the air gap
- How to fill and adjust the rinse agent
- How to remove white film with citric acid
Nothing on this page matches. Search all models
Error codes
| Code | Meaning | Checks |
|---|---|---|
| Start light flashing | The door was opened or the cycle was interrupted, so the dishwasher is paused. | Checks |
| Beeps once a minute | The door was opened during a cycle. The beep repeats until the cycle is restarted. | Checks |
| Sanitized light not on | The cycle did not meet the sanitization conditions, because it was interrupted or the incoming water was too cool to heat enough. | Checks |
| Lock Controls light on | The controls are locked. A cycle can be locked after it starts, so it cannot be changed. | Checks |
| LEAK DETECTED | On models with leak detection, the dishwasher found a possible leak and cancelled the cycle. | Checks |
GE Appliances codes on other models
Start light flashing
The Start status indicator light flashes. The door was opened or the cycle was interrupted, so the dishwasher is paused.
- Press Start once and close the door within 4 seconds. Pressing Start again while it runs cancels the cycle.
Source Source: Troubleshooting Tips: Start status indicator light flashing, p. 22
Beeps once a minute
The dishwasher beeps once every minute. The door was opened during a cycle. The beep repeats until the cycle is restarted.
- Press Start and close the door within 4 seconds.
Sanitized light not on
The Sanitized light does not come on at the end of a cycle with the sanitize option. The cycle did not meet the sanitization conditions, because it was interrupted or the incoming water was too cool to heat enough.
The door was opened and the cycle interrupted during the final rinse. Source: Troubleshooting Tips: Sanitized light does not illuminate, p. 24
- Do not open the door during the wash cycle.
The incoming water was too cold. Source: Troubleshooting Tips: Sanitized light does not illuminate, p. 24
- Raise the water heater temperature to 120–150 °F.
Lock Controls light on
The Lock Controls light is on and the pads do not respond. The controls are locked. A cycle can be locked after it starts, so it cannot be changed.
- Press and hold the lock pad for 3 seconds. GE names the Dry Boost pad, or on other models the sanitize pads, as the lock pad. The light goes off when the controls unlock.
LEAK DETECTED
The display shows LEAK DETECTED. On models with leak detection, the dishwasher found a possible leak and cancelled the cycle.
Source Source: Troubleshooting Tips: Display shows "LEAK DETECTED", p. 22
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 and flatware are not clean5 causes in the manual. First: the Ultra-Fine Filter or the Fine Filter is clogged.
- 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.
White film on glassware, dishes and the tub
A 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. Source: Troubleshooting Tips: A white film on glassware; Stained tub interior, pp. 23–24
- Remove the film with a citric acid cycle. See Remove white film with citric acid.
- Use a rinse agent to slow new build-up.
Glassware is cloudy and the cloudiness does not wash off
Etching, which is permanent. It comes from soft water combined with too much detergent, or from inlet water above 150 °F. Source: Troubleshooting Tips: Cloudiness on glassware, p. 22
- Use less detergent with soft water and wash glassware in the shortest cycle that cleans it.
- If the inlet water is above 150 °F, lower the water heater temperature.
Detergent is left in the dispenser cup
Dishes or utensils block the detergent cup or stop its door from opening. Source: Troubleshooting Tips: Detergent left in dispenser cups, p. 23
- Reposition tall utensils or heavy silverware so the cup door can open.
- Do not place large bowls or pots directly under the dispenser, so water from the lower spray arm can flush the cup.
Control panel lights go off while setting the controls
More than 30 seconds passed between pad presses. The display also turns off when the door stays open for two minutes. Source: Troubleshooting Tips: Control panel lights go off; Getting started: Start, pp. 9, 24
- Touch any pad again, or close and open the door, then make the selections within 30 seconds of each other.
Black or gray marks on dishes
Aluminum utensils rubbed against the dishes. Source: Troubleshooting Tips: Black or gray marks on dishes, p. 23
- Remove the marks with a mild abrasive cleaner.
Slight odor during the dry part of the cycle
Normal the first time Dry Boost is used: new parts are heating up. The odor fades after a short time. Source: Troubleshooting Tips: Slight odor, p. 23
Steam from the vent or warm air at the floor
Normal. Warm, moist air leaves through the vent during drying and pump-out, and air can be felt on the legs during a cycle. Source: Troubleshooting Tips: Steam; Feel air on your legs, p. 24
Clicks, water sounds and the pump starting and stopping
Normal: the detergent cup opening, water entering, the motor and spray arms starting and stopping, and the drain pump running several times during each drain. Rattling dishes or silverware means they need reloading. Source: Troubleshooting Tips: Noise, p. 24
How-to
- How to clean the filtersEvery other month or more often with heavy use, and when wash results drop or dishes feel gritty.
- How to clean the air gapWhenever the dishwasher is not draining well, if the sink has an air gap. The air gap is not part of the dishwasher and the warranty does not cover it.
- How to fill and adjust the rinse agentAbout once a month, and when spots or poor drying appear. The indicator window does not light up.
- How to remove white film with citric acidWhen glassware, dishware or the tub has a white hard-water film. GE says it can be repeated several times a year.
Maintenance
| Task | When | Source |
|---|---|---|
| Inspect and clean the filters | Every other month, or more with heavy use | Source: Care and cleaning: Filters, p. 21 |
| Refill the rinse agent dispenser | About once a month | Source: Dispensers: Filling the rinse agent dispenser, p. 10 |
| Clean the painted fingerprint-resistant door panel with a clean, soft, lightly damp cloth, then dry it | As needed | Source: Care and cleaning: Painted/coated door panel, p. 20 |
| Clean and deodorize the interior with citric acid or a dishwasher cleaner | As needed; for mineral deposits and hard-water film | Source: Care and cleaning: Dishwasher interior, p. 20 |
| Have a service technician protect the dishwasher against freezing: power off, water off, inlet line and water valve drained (professional service) | Before winter, if the dishwasher is in an unheated place | Source: Care and cleaning: Protect against freezing, p. 21 |
| Run all hot-water faucets for several minutes before using the dishwasher, with no smoking or open flame nearby, to release hydrogen gas | When the hot water has not been used for two weeks or more | Source: Water heater safety, p. 5 |
Settings
| Setting | Options | Notes | Source |
|---|---|---|---|
| Dry Boost | Off, Normal, High (on some models) | Normal adds up to 64 minutes; the fan may run up to 90 minutes after the cycle and stops if the door is opened. Off lets dishes air dry. Not available with Rinse. | Source: Getting started: Options, p. 8 |
| Wash Temp Boost | On, Off; can be changed during the wash | Raises the temperature for heavily soiled dishes and adds 20–50 minutes. Also improves drying on Normal. | Source: Getting started: Options, p. 8 |
| Sanitize option | On, Off | Raises the final rinse temperature to sanitize and can add 60 minutes. The Sanitized light confirms the conditions were met. | Source: Getting started: Options, p. 8 |
| Bottle Jets | On, Off | Runs the upper-rack bottle jets longer for baby bottles, sport bottles and tall cups; adds up to 23 minutes. | Source: Getting started: Options, p. 8 |
| Wash Zones | Upper, Lower | Washes one rack only, for half loads; shortens the cycle and saves energy. | Source: Getting started: Options, p. 8 |
| Delay Hours | Up to 8 or 12 hours depending on model | Press Delay Hours, then Start once, and close the door to begin the countdown. | Source: Getting started: Options, p. 8 |
| Control sounds | Press Dry Boost 5 times within 5 seconds to switch on or off | Source: Getting started: Mute, p. 9 | |
| Cancel a cycle | Hold Start for 3 seconds and close the door | The dishwasher drains, beeps and the cycle light goes off. | Source: Getting started: Cancel, p. 9 |
Cycles
| Cycle | Use | Run time (h:mm) | Source |
|---|---|---|---|
| AutoSense | Senses the soil level and adjusts the wash | 1:50–2:10 wash time | Source: Getting started: Select cycle, p. 7 |
| Heavy | Heavily soiled dishes, pots and pans with dried-on or baked-on food | 2:31 wash time | Source: Getting started: Select cycle, p. 7 |
| Normal | Daily full loads of normally soiled dishes; the energy rating cycle | 1:15–1:50 wash time | Source: Getting started: Select cycle, p. 7 |
| Light/China | Light to medium soil; safe for china and crystal with no options | 0:55 wash time | Source: Getting started: Select cycle, p. 7 |
| Rinse | Rinses partial loads to be washed later; no detergent | 0:16 | Source: Getting started: Select cycle, p. 7 |
| 1-Hour Wash | Quick wash for lightly soiled dishes; add Dry Boost for drying (adds 49–90 minutes) | 1:00 wash time | Source: Getting started: Select cycle, p. 7 |
Parts and consumables
| Item | Part number | Replace or refill | Specification | Source |
|---|---|---|---|---|
| Detergent | – | – | Automatic dishwasher detergent only; GE recommends tablets or packets. Cycles under 60 minutes: put the tablet in the pre-wash compartment or the tub bottom. Cycles of 60 minutes or more: main wash cup. | Source: Dispensers: Filling the detergent dispenser, p. 11 |
| Powder, liquid or gel detergent dose | – | – | Under 4 grains/gal: cup 1/3 full; 4–8: 2/3 full; 8–12: full; over 12: main and pre-wash cups | Source: Dispensers: Detergent dispenser, p. 11 |
| Rinse agent | – | About once a month | Liquid rinse aid; the dispenser holds 3.5 oz (104 ml) | Source: Dispensers: Filling the rinse agent dispenser, p. 10 |
| Citric acid kit | WD35X151 | – | Removes mineral deposits and hard-water film; order from GE Appliances Parts (877-959-8688) | Source: Care and cleaning: Dishwasher interior, p. 20 |
| Hard water test strip | WD01X10295 | – | Measures water hardness for the detergent dose; GE Appliances Parts 877-959-8688 | Source: Dispensers: Detergent dispenser, p. 11 |
Specifications
Built-in dishwasher with hidden controls, stainless steel interior and 16 place settings, rated at 48 dBA. Source: Features and benefits, p. 2
The model and serial numbers are on a label on the tub wall just inside the door; the model number is on the left-hand tub wall. Source: Cover; Care and cleaning: Exterior door panel, pp. 1, 20
The owner's manual defines no numbered error codes. Problems show through the Start status light, the Sanitized light, a beep every minute when the door is left open, and on some models the message LEAK DETECTED. Source: Troubleshooting Tips, p. 22
| Capacity | 16 place settings | Source: Features and benefits, p. 2 |
|---|---|---|
| Noise | 48 dBA | Source: Features and benefits, p. 2 |
| Electrical rating | 120 V, 60 Hz, 6.6 A connected load; heater 800/500 W | Source: Electrical rating, p. 1 |
| Supply circuit | 120 V, 60 Hz AC, 15 or 20 A fused supply; 2-wire with ground | Source: Electrical requirements, p. 5 |
| Inlet water temperature | 120–150 °F (49–66 °C) | Source: Dispensers: Check the water temperature, p. 10 |
| Water pressure | 20–120 psi | Source: Troubleshooting Tips: Dishes and flatware not clean, p. 22 |
| Rinse agent dispenser | 3.5 oz (104 ml), about one month of normal use | Source: Dispensers: Filling the rinse agent dispenser, p. 10 |
Recalls
No exact-model match for GDT645SYNFS in the U.S. Consumer Product Safety Commission recall database, checked . Recalls can name model families, so also check current recalls for GE Appliances.
Service 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
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.
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