DeLonghi DHP140 Moisture Sensing Error On Display How To Fix

Understanding the Moisture Sensing Error on Your DeLonghi DHP140

The DeLonghi DHP140 is a popular household humidifier that is designed to keep your living space comfortable by adding moisture to dry air. When the device operates normally it quietly delivers clean, cool mist. However, many owners have reported a specific problem: a moisture sensing error that appears on the display and stops the humidifier from running. This guide explains why that error happens, what it means, and how to fix it step by step. By the end of this article you will have a clear set of actions to restore your humidifier and keep it running smoothly for months to come.

What is the Moisture Sensing Error?

The DeLonghi DHP140 is equipped with an internal sensor that monitors the amount of water in the tank and the moisture level inside the unit. When the sensor detects an abnormal condition—such as a low water level, a fault in the sensor circuit, or a power surge—it triggers an error flag on the display. The error message usually reads something like:

MOISTURE SENSING ERROR

When this message is shown, the humidifier will not start until the problem is resolved. The message is DeLonghi’s way of protecting the device from damage and ensuring safe operation.

Why Does the Error Show Up?

A moisture sensing error can occur for several reasons. Knowing the most common triggers helps you eliminate possibilities quickly.

Low Water Level or Empty Tank

If the water tank is not properly seated or is too low, the sensor will think there is no water. Even a slightly misaligned tank can cause the sensor to read incorrectly.

Dirty or Damaged Sensor Contact

The sensor’s contact points are exposed to water and mineral deposits. Over time, limescale or dirt can block the contact, leading the sensor to misread the water level.

Faulty Power Supply

A sudden drop or spike in voltage can damage the sensor circuit. This is more common in areas with unstable electricity or if the unit is plugged into a shared outlet that has other heavy appliances.

Wear and Tear of Internal Components

After extended use, internal components such as capacitors or resistors can degrade. A degraded component can misinterpret signals from the sensor and trigger an error.

Software Glitch

The DHP140 firmware can occasionally get stuck, especially after a sudden power loss. A simple reset or firmware update can resolve this.

Step‑by‑Step Troubleshooting Guide

Below is a comprehensive troubleshooting process. Follow each step carefully, stopping at the first point where you find a solution. If the error persists after trying all steps, contact DeLonghi customer support or a qualified technician.

Safety First

1. Turn Off and Unplug – Before touching any part of the humidifier, switch it off and disconnect it from the wall outlet. This prevents electrical shock or accidental startup while you work on the unit.

2. Let the Unit Cool – If the humidifier has been running, allow it to cool for at least five minutes before handling the tank or interior parts.

1. Verify the Water Tank Position

• Remove the Tank – Detach the water tank from the humidifier body. Look for any visible misalignment or damage to the mounting tab.
• Inspect the Seal – The tank should sit flush against the base of the humidifier. If the seal is off, the sensor will not detect the water correctly.
• Re‑install Correctly – Place the tank back into its slot, ensuring it locks into place. The locking mechanism is usually a simple click or snap. Confirm that it feels firm and secure.

If the tank is correctly positioned and the error disappears, the problem was simply a misaligned tank. Re‑install the tank correctly to prevent future occurrences.

2. Check the Water Level

• Fill to the Minimum Mark – The DHP140 has a minimum water level indicator. Fill the tank up to the “Min” line. If you have previously filled the tank below this line, the sensor will trigger an error.
• Avoid Overfilling – Do not exceed the maximum line. Overfilling can cause leakage and sensor misreadings.

After refilling, power on the humidifier. If the error is gone, the low water level was the culprit. Keep this check in your regular maintenance routine.

3. Inspect and Clean the Sensor

The sensor is usually located near the water tank’s base. It may be covered by a small grille or hidden inside the humidifier housing.

• Remove the Grille – If your model has a grille, carefully pry it off. Use a small flat tool or a credit card to avoid scratching the surface.
• Look for Deposits – You may see mineral buildup or dried residue. This is common in areas with hard water.
• Clean with Distilled Water – Dampen a soft cloth or cotton swab with distilled water and gently wipe the sensor contacts. Avoid using soap or household cleaners, as residue can create new problems.
• Dry Completely – After cleaning, allow the contacts to air dry for a minute before re‑installing the grille.

If the sensor was dirty, cleaning it should resolve the error. Clean the sensor once a month or whenever you notice mineral buildup.

4. Perform a Hard Reset

A simple reset can clear many software glitches that cause sensor errors.

• Disconnect the Power – Leave the unit unplugged for at least 60 seconds. This gives the internal electronics time to reset.
• Reconnect and Power On – Plug the humidifier back in and turn it on. Watch the display to see if the error clears.

If the error persists, proceed to the next step.

5. Update Firmware (If Available)

DeLonghi sometimes releases firmware updates for their humidifiers. Updates can fix sensor logic bugs.

• Check DeLonghi Website – Visit the official DeLonghi support page and enter your model number (DHP140). Look for a firmware update download or a note about an update.
• Follow Update Instructions – Firmware updates often require a USB drive or a Wi‑Fi connection. Make sure to follow the manufacturer’s instructions exactly.
• Restart After Update – Once the update completes, power off, unplug, wait a minute, and then power back on.

After updating, the error should no longer appear. If it does, move to the next step.

6. Examine Internal Components

If you are comfortable opening the unit, you can check for damaged components such as capacitors or resistors. If you are unsure, skip this step and contact a professional.

• Open the Housing – Remove screws from the back panel. Keep them in a safe place.
• Inspect for Damage – Look for bulging, leaking, or discolored capacitors. Damaged components should be replaced.
• Check Wiring – Ensure all wires are connected properly and not frayed.
• Replace if Needed – If any component appears damaged, order a replacement part from DeLonghi or a certified parts supplier.

This step is advanced and should only be performed if you have experience with electronics. Many errors are resolved before reaching this point.

7. Contact DeLonghi Support

If none of the above steps fix the error, it is likely a deeper hardware fault or a rare software bug. Contact DeLonghi customer service for further assistance.

• Phone – Use the local support number found in your user manual or on the DeLonghi website.
• Email – Send a detailed description of your problem, steps you have taken, and any error codes.
• Warranty – If your unit is still under warranty, a repair or replacement may be covered.

DeLonghi’s support team can provide a serial number check, and they can offer a repair service or a replacement part.

Preventive Maintenance to Avoid Future Errors

Once the error is resolved, regular maintenance will help keep your humidifier running without interruptions.

• Clean the Tank Weekly – Empty and refill the tank each week to prevent mineral buildup. If you live in an area with hard water, consider using distilled water.
• Monthly Sensor Cleaning – Use a cotton swab with distilled water to clean the sensor contacts every month.
• Check the Filter – The humidifier has a filter that should be replaced every 3–6 months. A clogged filter can trigger sensor errors.
• Inspect for Leaks – Regularly check the base and tank joints for signs of leakage.
• Keep the Unit Dry – When not in use, keep the humidifier in a dry area to prevent mold growth.

By following this maintenance schedule, you can significantly reduce the likelihood of a moisture sensing error.

Frequently Asked Questions

What does the moisture sensing error mean for my humidifier?

It means the internal sensor has detected an abnormal water level or sensor fault. The unit will stop working until the issue is fixed.

Can I ignore the error and keep the humidifier running?

No. Ignoring the error can cause damage to the device or create unsafe operating conditions.

Does this error affect the air quality of my home?

Not directly, but if the humidifier stops working, the intended moisture control will cease, potentially leading to dry air and associated problems.

How long does it take to reset the sensor after cleaning?

Usually, a few minutes after plugging the unit back in. If the error persists, try a hard reset.

Is there a difference between “moisture sensing error” and other error codes?

Yes. DeLonghi displays specific error codes that indicate the nature of the fault. The moisture sensing error is the most common for the DHP140.

Will a new water tank fix the error if the sensor is faulty?

Replacing the tank will not fix a sensor fault. You need to address the sensor itself.

Conclusion

A moisture sensing error on the DeLonghi DHP140 can be frustrating, but it is usually straightforward to fix. By following a systematic approach—checking the water level, cleaning the sensor, performing a reset, and updating firmware—you can often resolve the issue without professional help. If the problem persists, reach out to DeLonghi support for further assistance. Maintaining a regular cleaning and inspection routine will help keep your humidifier running smoothly, ensuring a comfortable, healthy environment in your home.