Views: 2 Author: Site Editor Publish Time: 2025-10-22 Origin: Site
To determine whether a commercial dehumidifier is working properly, it can be comprehensively judged from three aspects: external status, operating data, and environmental changes. Here is a practical inspection guide.
1. Power supply and display
The power indicator light of the dehumidifier is on, and the display panel is working normally.
There are no alarm codes or flashing prompts (such as E1, E2 representing sensor or system errors).
2. Compressor operation
After starting the commercial dehumidifier, hear a slight compressor start sound or vibration;
After the compressor runs for a few minutes, there will be a significant temperature difference at the air outlet (cold front and hot back).
3. Fan operation
During the operation of the dehumidifier, there is a uniform and continuous airflow at the air outlet.
There is no abnormal noise or fluctuating wind speed.
4. Discharge of condensate water
The dehumidifier model using drainage pipes/water tanks should be able to continuously drain or accumulate water.
If there is no drainage during long-term operation, it may be due to dry air, blocked drainage pipes, or abnormal cooling.
1. Changes in humidity
Within 1-2 hours after starting the dehumidifier, there should be a significant decrease in ambient humidity (≥ 5% RH);
If there is no change in humidity for a long time, there may be insufficient refrigerant or blocked air circulation.
2. Temperature changes
The temperature at the air outlet is generally about 5-10 °C higher than that at the air inlet.
If the temperature difference at the air outlet is zero or even colder, it indicates abnormal heat transfer efficiency.
3. Current and power
Can be detected with a clamp meter or power meter: the operating current should match the nameplate markings (within ± 10%);
If the current is too low, it may be caused by insufficient refrigerant.
If the current is too high, it may be due to air duct blockage or abnormal compressor load.
Moisture reduction
Glass, walls, and floors no longer condense or become damp;
The surface of cardboard boxes and wooden products is dry and free of a mold smell.
Improvement of Air Quality
It no longer has a musty or stuffy smell.
Especially evident in warehouses or basements.
Continuous dehumidification capability
If the environmental humidity remains high and the equipment runs for a long time with good drainage, then the system is healthy.
If the drainage stops quickly after starting, it indicates that the humidity sensor or control system may be abnormal.
Phenomenon | Possible reasons | Suggestions |
No condensate discharge | The environment is too dry/the drainage pipe is blocked/the refrigeration system is leaking fluorine | Check the drainage pipe, measure the temperature difference, and check the fluoride pressure |
Frequent start-stop of the compressor | Humidity sensor misalignment/control system issues | Calibrate the sensor and check the motherboard |
The temperature difference of the outlet air is too small | Evaporator frosting/air duct blockage | Clean the filter screen and check the defrosting system |
Abnormal noise or vibration | Loose fan blades/loose compressor fixing screws | Tighten the components and keep them horizontally placed |
The displayed humidity does not match the actual situation | Sensor aging | Re-calibrate or replace the sensor |
According to our company's engineers, a functioning commercial dehumidifier should meet the following four requirements:
There is wind, temperature difference, and condensate discharge.
The humidity gradually decreases.
No alarm code or abnormal noise;
The power and current remain stable within the normal range.
If your dehumidifier experiences any abnormal conditions, you can follow the instructions above for maintenance. If it cannot be resolved, contact the dehumidifier manufacturer as soon as possible for handling. If you want to obtain high-quality commercial dehumidifiers, please contact us. Preair is a dehumidifier manufacturer with over 20 years of experience. We are the source manufacturer and provide large quantities of high-quality and affordable dehumidifiers.
