Water
Water Downstream
Check drains, dryer load, inlet temperature, pressure dew point and whether downstream piping is colder than the delivered dew point.
Compressed Air Dryer Diagnostic Guide
Air Dryer Troubleshooting Guide
Air dryer problems usually trace back to operating conditions, drainage, airflow, temperature, filtration, refrigeration components, desiccant condition or control valves. Start with the symptom, then verify the basics before replacing equipment.
Quick Answer
When an air dryer is not performing, first check whether airflow, pressure, inlet temperature and ambient temperature are within the rating. Then inspect drains, filters, alarms and the delivered pressure dew point.
How It Works
Pressure
High Differential Pressure
Inspect filters, valves, piping, heat exchangers and whether the dryer is undersized for peak flow.
Controls
Alarm or Shutdown
Record the exact alarm code and verify power, ambient temperature, ventilation and operating conditions.
Selection and Troubleshooting Guide
Practical Compressed Air Guide
| Condition | Recommended Starting Point | Why | What to Verify |
|---|---|---|---|
| Water downstream | Drain failure, overload or elevated dew point | Moisture is not being removed or is re-condensing | Check drain, peak CFM, inlet temperature and line temperature. |
| High pressure drop | Loaded filter or undersized dryer | Flow restriction increases under load | Measure pressure before and after each component. |
| Refrigerated dryer overheats | Dirty condenser or poor ventilation | The refrigeration system cannot reject heat | Clean condenser and verify ambient rating. |
| Desiccant dryer has high dew point | Wet or contaminated desiccant, purge or valve problem | The bed is not adsorbing or regenerating correctly | Inspect prefilters, purge flow, valves and media. |
Interactive Tool
Preliminary Recommendation
Primary recommendation—
Supporting action—
Next step—
Maintenance and Verification
Inspect
Check operation, alarms, drains, differential pressure and visible contamination.
Document
Record service dates, measurements, element changes and unusual conditions.
Verify
Confirm that the component still meets the process requirement under peak operating conditions.
Shop Relevant Equipment
Replacement
Air Dryers
Browse refrigerated and desiccant dryer options.
Protection
Compressed Air Filters
Replace loaded filters and protect dryer performance.
Desiccant Service
Replacement Desiccants
Browse activated alumina and molecular sieve products.
Need Help Confirming the Correct System?
Provide the equipment model, airflow, pressure, temperatures, application and current symptoms.
Related Air Treatment Resources
Air Dryer Troubleshooting Guide FAQs
Why is water getting past my air dryer?
Possible causes include drain failure, overload, high inlet temperature, dirty heat exchangers, failed refrigeration performance or piping colder than the delivered dew point.
Why does my air dryer have high pressure drop?
Common causes include loaded filters, undersized equipment, internal restriction or flow above the rated capacity.
Why does my refrigerated dryer overheat?
Dirty condensers, poor ventilation, high ambient temperature or refrigeration faults can cause overheating.
Why does a desiccant dryer have a high dew point?
Possible causes include contaminated desiccant, low purge flow, valve leakage, switching problems or wet inlet air.
Should I bypass a failed dryer?
Bypassing may send untreated air into the plant. Follow the facility procedure and protect moisture-sensitive equipment.
When should an air dryer be replaced?
Replacement may be appropriate when capacity, reliability, efficiency or repair cost no longer meets the system need.