Common Faults and Practical Solutions for High-Low Temperature Humidity Test Chambers

High and low temperature humidity test chambers are key reliability testing equipment, widely used in electronics, automotive and biomedicine. Their stability directly affects test accuracy. This article summarizes common faults and solutions for efficient troubleshooting.

I. Temperature-related Faults: Core Impact on Test Accuracy

1. Failure to Reach Set Temperature

Fault Performance: Fails to reach target temperature when heating; slow or no cooling.
Possible Causes: Abnormal power voltage, burned heater, compressor failure, fan stop, air duct blockage.
Solutions: Verify power matches rated specs (220V/380V); check fan operation and clean duct debris; contact professionals to replace faulty parts if heater/compressor fails.

2. Large Temperature Fluctuation and Poor Uniformity

Fault Performance: Excessive temperature difference in the chamber or frequent fluctuations near set value.
Possible Causes: Abnormal fan speed, damaged air duct seals, over-dense samples blocking airflow.
Solutions: Arrange samples for ventilation; check fan stability and replace damaged seals promptly.

3. Severe Temperature Overshoot

Fault Performance: Temperature overshoots set value significantly before dropping.
Possible Causes: Improper controller settings, energy regulation system failure.
Solutions: Restart to reset parameters; if unresolved, have technicians calibrate controller or overhaul regulation modules.

II. Humidity-related Faults: Directly Linked to Test Environment Stability

1. Failure to Reach Set Humidity

Fault Performance: Slow or no humidification.
Possible Causes: Empty humidification tank, faulty water level sensor, burned humidifier tube, blocked solenoid valve.
Solutions: Replenish water; clean valve filter; replace tube or repair sensor if humidifier fails to heat.

2. High Humidity That Cannot Be Reduced

Fault Performance: Humidity remains above set value; dehumidification fails.
Possible Causes: Faulty dehumidification system, poor chamber sealing, high ambient humidity.
Solutions: Check door seals and reduce ambient humidity; report for repair if dehumidification module fails.

3. Abnormal Humidity Display

Fault Performance: Humidity reading jumps, disappears or deviates greatly from reality.
Possible Causes: Aging humidity sensor, contaminated probe.
Solutions: Wipe probe with clean cloth; calibrate or replace sensor if inaccuracy persists.

III. Operation and Circulation Faults: Ensure Basic Equipment Operation

1. Fan Not Rotating or Making Abnormal Noise

Possible Causes: Motor damage, foreign objects in fan blades, worn bearings.
Solutions: Clean debris after power-off; replace motor or bearings if fault persists.

2. Compressor Abnormality

Fault Performance: Compressor fails to start or stops frequently after starting.
Possible Causes: Power phase loss, overload protection trigger, refrigerant leakage.
Solutions: Check three-phase wiring; retry after overload reset; report for refrigerant and compressor inspection if fault recurs.

3. Equipment Alarm

Fault Performance: Alarms like "phase loss" or "overload" activate.
Possible Causes: Triggered protection from wrong phase sequence, unstable voltage or overheated components.
Solutions: Troubleshoot per alarm; restart after 30-minute cooldown for overload; report if ineffective.

IV. Core Notes

1. Always power off before troubleshooting to avoid shock or component damage.
2. Contact professionals for complex repairs (compressors, refrigerants, circuit boards); do not disassemble yourself.
3. Regularly clean air ducts, filters and sensors to reduce over 80% of common faults.