If the orange descale light on a De’Longhi Dedica EC685 keeps flashing after you already descaled the machine, do not immediately reset everything. De’Longhi has an official explanation for one common case: the machine may not have fully registered the descale you carried out.
What does the orange light mean?
De’Longhi’s current EC685/EC695/EC785 indicator table says a flashing orange descale light means the appliance needs descaling, and the operation is complete when the light goes off. The machine therefore needs to reach the completion state of its programmed maintenance cycle.
Simply running descaler through ordinary hot-water mode is not necessarily the same as completing that registered cycle.
Why can the light stay on after descaling?
De’Longhi’s own Dedica FAQ says the machine may not have fully registered the descale. Its recovery procedure re-enters descale mode, runs the remaining water, refills for a rinse while the light is still flashing, completes that rinse, then returns the steam dial to off.
What is the documented EC685 descale sequence?
- Turn the machine on and prepare the tank with the specified descaler/water solution.
- Use a large container under the hot-water spout and brewing unit.
- Hold the steam button for about 10 seconds until the lights flash in sequence.
- Turn the steam dial to the descale/open position and press the steam button.
- Let the automatic interval deliveries run; route small quantities through the brewing unit as the guide instructs.
- When the tank empties and the orange light flashes, rinse the tank and refill with fresh water.
- Start the rinse phase and follow the guide’s routing instructions.
- When the rinse tank empties, return the steam dial to off.
Use the current manual/quick guide for your exact EC685 revision rather than an undocumented button sequence copied from another De’Longhi.
What if the machine requests another rinse?
De’Longhi has a current Help Center entry for exactly this symptom. It identifies a potential cause: the water tank was not filled to MAX during the rinse cycle. The official response is to repeat the rinsing cycle.
That is stronger evidence than immediately factory-resetting the machine.
What if descale starts and stops after a few seconds?
That is a different symptom. Several 2026 EC685 owners report the machine entering descale mode, pumping briefly and stopping while the orange light remains. One January 2026 owner later reported that restarting the entire process while following De’Longhi’s official procedure/video finally cleared the stuck state.
Other owners did not report a confirmed repair. Some commenters proposed a flowmeter fault, but an unverified forum theory is not a diagnosis. If the exact official cycle cannot progress despite a full/seated tank and normal water flow in other modes, move to deeper service diagnosis.
What if normal hot water works but descale mode does not?
Record that difference. A 2026 owner reported normal manual hot-water flow while programmed descale produced only a few drops and stopped. That shows the machine can move water in at least one operating mode; it does not prove which control or sensing component is faulty.
For support, record group flow, manual hot-water flow, rinse behavior and exactly where the descale program stops.
What if no water comes out in normal modes either?
Leave the warning-light branch. De’Longhi’s current “No espresso coffee is delivered” path starts with water supply/tank checks. If the machine cannot move water normally, repeatedly restarting descale mode will not solve the underlying no-flow fault.
Why can the light return unusually soon?
The EC685 has a programmable water-hardness level. De’Longhi’s current quick guide explicitly says choosing the correct hardness is important because it sets the frequency of descaling cycles. The guide includes a hardness test strip and instructs owners to program the matching level.
So the reminder is not a sensor directly measuring the mass of scale inside the thermoblock. It is a maintenance schedule influenced by the programmed hardness and machine use.
If your reminder returns every few weeks, test your water and verify the setting. Do not simply choose “soft” to silence the light if your water is actually hard.
Does filtered or bottled water automatically count as soft?
No. Some filters reduce hardness; others mainly reduce chlorine or improve taste. Bottled waters also vary widely in calcium and magnesium. Use the supplied hardness strip or reliable water data.
| Symptom | First branch |
|---|---|
| Light never cleared after descale | Complete/repeat official descale + rinse so the cycle registers |
| Machine asks for another rinse | Repeat rinse with tank filled as instructed |
| Light cleared, then returned very soon | Check actual/programmed water hardness |
| Descale starts then stops after seconds | Verify tank/flow; repeat exact official cycle; service if it cannot progress |
| No water in normal modes | Diagnose water supply/flow rather than the reminder |
| All lights flash and machine does not function | Power off/disconnect and follow De’Longhi support guidance |
Should you use vinegar or an improvised acid?
Follow De’Longhi’s current descaling instructions and approved descaler guidance. The documented procedure is written around the specified descaler dilution. Different acids and concentrations change material compatibility and rinsing requirements.
Can you just ignore the light?
Ignoring a reminder does not remove scale. De’Longhi’s manual warns that scale-related repairs may not be covered when the specified descaling procedure is not performed regularly. Set hardness correctly and complete the cycle rather than fighting the indicator.
Should you factory-reset the machine?
Not first. De’Longhi provides a specific descale-registration recovery procedure. Use that before an unrelated settings reset. If the official cycle cannot complete, preserving the exact symptom is more useful for diagnosis than trying many undocumented button combinations.
What if the machine overheats while stuck in descale mode?
Stop and unplug it. A 2026 owner reported both a failed programmed descale cycle and abnormal overheating/auto-off behavior. That combination goes beyond a routine maintenance-light problem.
What should you record before asking for help?
| Record | Example |
|---|---|
| Exact model / EX revision | EC685.M / EC685.R EX:4 |
| Light behavior | Orange flashing / steady / all lights |
| Where cycle stops | Descale / rinse / after seconds |
| Normal espresso flow | Yes / no |
| Manual hot-water flow | Yes / no |
| Water-hardness setting | Soft / medium / hard / unknown |
| Descaler used | Product and dilution |
| Recent repair | Pump / flowmeter / tubing / none |
Where should a Dedica owner continue?
Use the Dedica EC685 machine hub and Dedica modding guide for model context. If the actual problem is weak/spitting steam, use the Dedica steam fault guide. If espresso flow changed only after a single-wall basket conversion, use the non-pressurized basket dialing guide.
References
- De’Longhi — Dedica descale registration FAQ
- De’Longhi — further rinse requested
- De’Longhi — steam/descale light flashing
- De’Longhi — EC685 quick guide: hardness and descale
- De’Longhi — EC685/695/785 manual
- Owner case — stuck descale mode (2026)
- Owner case — stalled descale plus overheating (2026)
Evidence note: De’Longhi documentation establishes the indicator meaning, hardness scheduling and official descale/rinse recovery. Owner cases illustrate real stuck-cycle patterns; unconfirmed forum theories are not presented as diagnosis.