Owner’s manual
Error Codes
How to get LG dishwasher out of sleep mode?
On the LG LDT5678BD dishwasher, what many people call “sleep mode” is usually the controls being locked. If you see CL on the display, press and hold Half Load and Energy Saver together for 3 seconds to turn Control Lock off (the CL indicator should clear). See the owner's manual for the exact button locations on your control panel.
- Look at the display for CL (Control Lock) or any code.
- Press Power once to wake the control.
- Make sure the door is fully closed and latched.
- If you just opened the door, restart using the correct Start method (below).
- If a test or setting mode is showing (for example n:#, U:#, d:#, t#, or L0-L4), power the unit off and on to exit.
Your LG LDT5678BD uses one of these start methods:
| Start method | What to do | What happens if you miss the timing |
|---|---|---|
| Method 1 | Press Start, then close the door within 4 seconds | The time LED flashes, you may hear a tone, and the cycle will not start |
| Method 2 | Close the door first, then press Start | If Start is not pressed, the cycle will not start |
Control Lock prevents accidental button presses, and the 4-second Start timing prevents the dishwasher from running with the door unlatched. Clearing CL and starting the cycle the right way gets your wash program running normally.
If the dishwasher “wakes up” but still will not run, a stuck drain condition or water issue can keep it from operating. Common repair parts for this model include the dishwasher drain pump ABQ75742501 and the dishwasher electronic control board assembly AGM76429510. You can order model-matched parts from the list for LDT5678BD, or search by model on Sears PartsDirect.
Last updated: February 2026
What is the most common problem with the LG dishwasher?
For the LG LDT5678BD dishwasher, the most common problems we see are drainage and water-flow issues caused by clogs (filters, drain hose, air gap/disposal) and oversudsing from using the wrong detergent. These are usually fixable with cleaning, correct loading, and routine maintenance; see the owner's manual.
- Not draining: check the filter area for debris, then inspect the drain hose for kinks or clogs.
- Poor cleaning: confirm spray arms can spin freely and the filters are clean.
- Water inlet problems: make sure the inlet hose is not kinked and the water supply is fully on.
- Oversudsing: only use automatic dishwasher detergent (never hand dish soap).
- Leaks: confirm the dishwasher is level and the door seal is clean and seated.
- Turn off power at the breaker before reaching into the sump area.
- Remove and clean the filters; rinse under hot water and scrub with a soft brush.
- Check the drain path: air gap (if present), garbage disposal inlet, and drain hose routing.
- Run hot water at the sink for 30 to 60 seconds before starting a cycle to improve wash and dry performance.
- Use rinse aid and adjust the rinse aid level if drying is weak.
If cleaning does not restore normal operation, these model-matched parts are common next steps:
| Symptom | Likely area | Example part for LDT5678BD |
|---|---|---|
| Won’t drain, standing water | Drain system | Dishwasher drain pump ABQ75742501 |
| Leaks at the door | Door sealing | Dishwasher door seal 3920DD3002D |
| Dishes not getting clean | Wash coverage | LG dishwasher spray arm, lower AGB73932401 |
Clogged filters and drain restrictions can trigger drain and inlet errors, leave water in the tub, and reduce cleaning performance. Using the correct detergent and keeping water flowing freely helps protect the pump, sump, and control system.
For error messages and what they mean, use our LG dishwasher error codes reference.
You can also order replacement parts for your LG LDT5678BD from the parts list for this model, or search by model number on Sears PartsDirect.
Last updated: February 2026
What is error code 3E on LG dishwasher?
On an LG LDT5678BD dishwasher, a 3E error points to a heating-related problem (the dishwasher is detecting abnormal water heating or a heater circuit issue). Start by canceling the cycle, letting the unit cool, then restarting; use the troubleshooting steps in the LDT5678BD owner's manual to confirm the exact condition tied to the code.
- Turn the dishwasher off, then back on to clear a one-time control glitch.
- Run hot water at the kitchen sink for 30 to 60 seconds before starting a cycle so the dishwasher fills with consistently hot water.
- Make sure you are using automatic dishwasher detergent (not hand dish soap).
- Confirm the dishwasher is level; poor leveling can contribute to performance issues that look like heating or wash problems.
- If the unit is actively leaking or you see water in the base, shut off the water supply and stop using the dishwasher until the cause is corrected.
A 3E code is commonly tied to the dishwasher’s ability to heat and monitor water temperature. That can involve the heater circuit and temperature sensing logic (thermistor), or conditions that cause the unit to detect heating outside its expected range.
| What’s going on | What you may notice | What to do next |
|---|---|---|
| Water is not heating correctly | Cycle stops mid-wash, poor drying | Try a restart; then follow the manual’s error-code steps |
| Temperature sensing issue | Code returns quickly after start | Check wiring connections only if you’re qualified; otherwise schedule service |
| Water supply temperature is inconsistent | Long cycle times, weak drying | Purge cold water at sink; use High Temp/Extra Dry options as needed |
If you’re also seeing draining problems or standing water along with the error, address that first because poor draining can trigger multiple symptoms.
Heating and temperature feedback affect wash performance, sanitizing temperatures, and drying. Fixing the underlying cause helps prevent repeat shutdowns and improves cleaning results.
You can order replacement parts for your LG LDT5678BD from the parts list for this model, or search by model number on Sears PartsDirect.
Last updated: February 2026
What does night dry do on an LG dishwasher?
On the LG LDT5678BD dishwasher, Night Dry helps dishes dry better when they sit overnight by running the ventilation fan periodically after the cycle ends to vent steam and moist air, reducing condensation that can leave dishes wet.
Night Dry is a moisture-venting feature; it improves drying by moving humid air out of the tub.
- Runs the ventilation fan periodically after the wash ends
- Helps prevent steam from condensing back onto dishes
- Useful when you will not unload right away (overnight)
- You can stop the post-cycle fan by opening the door after the cycle ends
Use the control-panel shortcut described in the LDT5678BD owner's manual.
- Select a wash cycle.
- Press and hold Extra Dry for 3 seconds to activate Night Dry.
- For the Normal cycle, use the same press-and-hold method to add Night Dry.
| Option | What it changes | Best use |
|---|---|---|
| Extra Dry | Adds drying time and raises heated rinse temperature | Loads that need stronger overall drying |
| Night Dry | Vents steam using the fan after the cycle | Loads left in the tub overnight |
| Extra Dry + Night Dry | Combines added heat/time with venting | Plastics and mixed loads |
When the door stays closed after a cycle, warm steam can condense on cooler items (especially plastics and nonstick surfaces). Night Dry reduces trapped moisture so dishes are drier when you unload later.
If you are also seeing standing water that re-wets dishes, a drain issue can contribute; the LG dishwasher drain pump ABT72989206 is a common part involved in draining.
You can order replacement parts from the parts list for this model, or search by model number on Sears PartsDirect.
Last updated: February 2026
