Wet membrane humidifiers, with their “isenthalpic humidification” capability, effectively increase air humidity while providing 

some air purification benefits. They are widely used in server rooms, workshops, archives, and residential environments. However, 

as equipment involving the interaction of ‘water’ and “air,” prolonged operation inevitably leads to performance degradation 

or component aging.

Proper daily maintenance not only extends the unit's lifespan but also prevents secondary contamination. Below is a detailed 

breakdown of maintenance techniques and troubleshooting methods for humidifiers.

I. Daily Maintenance of Core Components

The core components of a humidifier primarily include the humidification pad, water tank, water pump, and fan. Regular cleaning 

and upkeep are fundamental to ensuring optimal humidification efficiency.

1. Cleaning and Replacing the Humidification Pad

The humidification pad serves as the medium for water evaporation. Over time, calcium and magnesium ions in the water form 

scale deposits that clog the pad's pores, obstructing airflow and reducing humidification efficiency.

• Cleaning Frequency: Recommended every 3-6 months, depending on water hardness.

• Cleaning Method:

1. Disconnect power and remove the humidification pad.

2. Rinse surface dust with clean water from top to bottom.

3. For severe scaling, soak in a 5%-10% citric acid solution for 30-60 minutes. Once scale softens and breaks down, thoroughly

   rinse with clean water (avoid vigorous scrubbing with hard brushes to prevent damaging the hydrophilic coating).

• Replacement Cycle: The wet film is a consumable. If it remains hardened, deformed, or retains odors after cleaning, replacement

  is generally recommended every 1-2 years.

2. Tank and Base Disinfection & Anti-Bacterial Measures

Stagnant water in humid environments readily breeds bacteria and mold, which are the root cause of humidifier odors.

• Drainage Procedure: When storing the unit long-term or seasonally, ensure all water is completely drained from the water tank

  and base tray.

• Regular Disinfection:

1. Monthly disinfection can be performed by soaking the water tank in food-grade citric acid or a specialized disinfectant.

2. Use a soft cloth to wipe the inner walls of the tank and the float switch, removing any slippery biofilm.

3. After cleaning, it is recommended to rinse the tank twice with clean water to eliminate any residual acidic odor.

3. Water Pump and Inlet Valve Inspection

Blockages in the water circulation system prevent uniform humidification of the wet membrane, causing localized dry spots.

• Water Path Inspection: Observe whether water flows evenly from the water distributor. If flow is weak or absent, check if

  the inlet filter screen is clogged with sediment or debris.

• Pump Cleaning: For models with a circulation pump, periodically disassemble the pump housing to remove tangled debris

  (e.g., fluffy debris).

• Drain Pump Maintenance: If the unit features automatic drainage, inspect the drain pipe for obstructions to ensure unimpeded

  drainage and prevent water overflow onto the base.

4. Air Duct and Fan Blade Cleaning

Dust accumulation on fan blades and ducts not only reduces airflow but may also cause musty odors when blown out with moisture.

• Cleaning Method: Use a long-bristled brush or vacuum cleaner to remove accumulated dust from the fan impeller.

• Air Inlet Filter: If the machine's air inlet is equipped with a primary filter, clean it every two weeks to prevent restricted airflow

  that reduces humidification efficiency.

II. Common Malfunction Causes and Solutions

Even with regular maintenance, equipment may encounter abnormalities during operation. Below are the most common fault 

symptoms and troubleshooting logic.

Issue 1: Reduced Humidification Output / Air Feels Dry

This is the most frequent problem, typically indicating insufficient water absorption by the humidification membrane or 

decreased airflow.

Possible Causes & Solutions:

• Clogged Humidification Membrane: Pores blocked by scale or dust, preventing airflow.

  --Solution: Clean or replace the humidification membrane.

• Uneven water distribution: The top water distributor or distribution holes are clogged, leaving the wet membrane dry.

  --Solution: Clear the water distribution lines and clean the filter screen.

• Inlet solenoid valve malfunction: Insufficient water supply to the tank, resulting in low water level.

  --Solution: Check water source pressure or replace the solenoid valve.

• Abnormal fan speed: Motor capacitor aging or bearing oil shortage causes slow rotation.

  --Solution: Inspect and repair the fan motor.

Issue 2: Foul Odor in Blown Air (Sour/Musty Smell)

This is the most frequently reported user complaint, impacting both user experience and air quality.

Possible Causes and Solutions:

• Deteriorated Wet Pad: Extended use has caused bacterial growth or mold within the pad material.

  --Solution: Clean immediately. If odor persists after cleaning, replace with a new wet pad.

• Stagnant water decay: Water has accumulated in the tank or base for an extended period without drainage, fostering anaerobic bacteria.

  --Solution: Thoroughly clean the tank and base, and regularly perform high-temperature or chemical disinfection using descaling agents.

• Water source contamination: The water source is unclean (e.g., unfiltered tap water), allowing microorganisms to proliferate.

  --Solution: Use purified water or install a filtration device at the water inlet.

Issue 3: Water Leakage or Overflow

Leaks not only create slippery surfaces but may also damage internal circuits.

Possible Causes and Solutions:

• Water Level Switch Malfunction: Float switch jammed or damaged, causing continuous water intake.

  --Solution: Clean debris around the float to restore free movement; replace the switch if damaged.

• Drain Pipe Blockage: Foreign objects obstructing the drain pipe, causing water to overflow from the base.

  Solution: Clear the drain pipe.

• Aged seals: After prolonged use, seals at the water tank or pipe connections may age and crack.

  Solution: Inspect connections and replace seals.

Problem 4: Increased Machine Noise

Possible Causes and Solutions:

• Fan Abnormal Noise: Loose fan impeller or worn bearings.

  --Solution: Tighten the impeller or replace the fan.

• Pump Resonance: Vibration from the pump resonates with the machine housing.

  --Solution: Check if the pump mounting screws are loose, or add vibration-damping pads under the pump body.

• Water flow sound: Normal sound when the inlet valve opens or during drainage. If the sound is excessively loud,

  --Solution: check if the water pipe is suspended and colliding with the housing.

III. Recommended Maintenance Schedule

For more intuitive operation, refer to the following maintenance cycle:

Conclusion

The core of humidifier maintenance lies in ensuring the unobstructed flow of “water” and ‘air’ while controlling “bacteria.” 

By mastering the maintenance techniques and troubleshooting approaches outlined above, you can significantly enhance the 

device's operational efficiency, ensuring stable and hygienic performance throughout the entire humidification season. 

When encountering complex electrical faults, it is recommended to contact professional after-sales service personnel for resolution.