Air Compressor Dryer Troubleshooting Guide | Problems & Fixes – Wemano
Learn why your air compressor dryer isn’t working and how to fix it. Step-by-step troubleshooting guide and maintenance tips from Wemano experts.
Sofiya
10/21/20252 min read
Problems with Air Compressor Dryer: Causes and Fixes
If you’ve ever heard your air tools hissing with moisture or seen water dripping from the air line, you know how frustrating a faulty air compressor dryer can be. One of our small workshop clients once complained: “The dryer looks fine, but my air tools are still spitting water.”
This problem is more common than you think — and it’s not always the dryer’s fault. In this guide, we’ll walk you through the most common air compressor dryer problems, how to troubleshoot them, and what you can do to prevent future issues.
1.Common Problems Users Face:
Dryer not removing moisture properly — This usually happens when the inlet air is too hot or humid.
Pressure drop across the dryer — Can be caused by clogged filters or a dirty heat exchanger.
Oil contamination in compressed air — Indicates oil carryover from the compressor.
High dew point / moisture at tool outlet — Could be due to a malfunctioning condensate drain.
Wemano Tip: Use a pre-filter before your dryer to capture oil mist and reduce maintenance frequency.→ Wemano Screw Air Compressor with Dryer
2.Why Isn’t My Air Compressor Dryer Working?
Many users jump straight to replacing the dryer, but often the issue lies elsewhere.
Check inlet air temperature and humidity. The air entering the dryer should be under 38°C (100°F).
Verify the condensate drain. If it’s stuck, water will accumulate inside the dryer.
Inspect the refrigerant or desiccant system. Low refrigerant levels or expired desiccant can cause high dew points.
Electrical faults. Faulty wiring or sensors can cause the unit to shut down.
3.Troubleshooting Air Compressor Dryer Step-by-Step:
Level 1 — Basic Checks (For Any Operator)
Tip: 80% of rotary screw air compressor problems come from wiring, filters, or oil level.
Level 2 — Component Diagnosis (Technician Level)
Airend and Valves Section
Symptom: Compressor builds low pressure
→ Check: Inlet valve stuck, minimal pressure valve leakage.
→ Fix: Clean or replace valve kit (insert [link to Wemano valve parts page]).
Oil System
Symptom: Oil carryover or air/oil separator clogging
→ Check: Oil return line blockage, separator element hours.
→ Fix: Replace separator; drain condensate daily.
Cooling System
Symptom: Frequent high-temp shutdowns
→ Check: Cooler blockage, fan direction, ambient air flow.
→ Fix: Clean radiator; ensure airflow clearance 1m+.
Level 3 — Electrical & Control System Diagnostics
4.How to Maintain Your Air Compressor Dryer:
Drain water daily to prevent corrosion.
Replace filter elements every 2–3 months.
Keep room temperature below 35°C.
Inspect dew point indicator weekly.
At Wemano, our rotary screw air compressors with dryers come with integrated auto-drain systems, making maintenance easier and reducing moisture risk.
Conclusion:
Proper troubleshooting and maintenance can significantly extend your dryer’s lifespan. Whether you’re facing moisture, oil, or power issues, following these steps will save you time and cost.
Explore Wemano Screw Air Compressors with Dryer for reliable, long-lasting performance.