How to Fix Hisense Dehumidifier Error Code E9 [2024]

Struggling with the pesky flashing “E9” error preventing the normal function of your Hisense dehumidifier? This common fault code signals issues with water drainage that require do-it-yourself maintenance and repair. Don’t sweat it – this step-by-step guide digs into the root causes and solutions to banish error code E9 for good.

What Causes Hisense Dehumidifier Error Code E9?

The E9 message relaying “abnormal water full” on your Hisense dehumidifier generally stems from drainage issues that prevent extracted moisture from properly exiting the bucket or pump system. Typical causes include:

  • Accumulated dirt, dust, or grime clogging the hose or pump
  • A loose hose connection letting water backflow
  • Faulty water level sensor providing false readings

Note if your Hisense dehumidifier lacks a drainage hose or pump and instead utilizes a water bucket, overflowing capacity or a missing bucket could also trigger error code E9.

By methodically checking each potential root cause above, we can isolate and then fix it. 

Steps to fix Hisense Dehumidifier Error Code E9

E9 Error on Hisense Dehumidifier

1. Inspect Drain Hose 

First, power down and unplug your Hisense dehumidifier before inspecting any components. Check along the entire drain hose routing looking for tight bends, crimps, or blockages preventing water from exiting. 

Also examine the hose connection point on the dehumidifier casing itself for gaps, cracks, or detachment issues letting water backflow internally rather than out the drain path.

You can use a shop vac to clear any gross debris clogging the hose. Straighten out kinked sections for smooth flow. Reseat the connection fittings firmly and replace any leaky parts.

2. Wash and Clear Pump 

If your Hisense dehumidifier recirculates via an internal pump, residue buildup is a common E9 culprit. Carefully access and then detach the pump housing based on specific model directions to inspect. Flush and wash out any accumulated dirt, algae, or grime in the pump body and all inlet/outlet passages.

Clear particulate clogging of small waterways is vital for the pumping mechanism to avoid future failure. Clear blockages for unimpeded drainage flow that prevents abnormal water detection.

3. Wipe and Dry Water Level Sensors

Some Hisense dehumidifier models employ integrated water level sensors to gauge internal collection bucket volume and trigger pump operation. Dust and mineral accretion on their probes can obstruct reads leading to premature E9 errors.

Locate the 1-3 sensors along the bucket perimeter and wipe clean using isopropyl alcohol applied to a cotton pad. Check associated wiring is intact and seated properly on control board mounts. Allow to fully dry before reinstalling the bucket and testing.

4. Reset and Reseat Pump Impeller

For integrated pump setups, the rotor assembly called an impeller provides flow force to displace extracted water collected from the air. Over time debris ingestion or natural wear can bind this component causing pump failure and triggering the “abnormal water full” E9 message.

Usually just unplugging and then reconnecting power resets the impeller while flushing any particles, but replacements are affordable from the manufacturer if needed. Make sure it spins freely without obstruction when wired.

5. Detect Leak

If no obvious drainage pathway faults are found externally, another possibility is internal coolant or water leaks trickling onto water level probes prematurely throwing E9 errors. 

You’ll need to methodically trace tubing paths, component seals, and the condenser coil looking for weeps or drip points with a flashlight and magnification.

Any identified leaks must get professionally resealed to prevent damage plus resolve the phantom E9 situation by preventing liquids from reaching detection sensors erroneously. Refrigerant repairs require proper HVAC expertise.


Hisense dehumidifier error code E9 generally is caused by obstructed drainage flows or failings around internal water level sensors setting off “abnormal water full” alerts prematurely. By taking a measured and methodical troubleshooting approach and inspecting hoses, fittings, pumps, buckets, and control electronics for faults – the E9 message can be solved.

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