RV air conditioning units can leak water due to issues such as a clogged condensate drain, a disconnected drain line, or melting ice from a frozen evaporator. Regular maintenance and immediate troubleshooting can resolve these issues and prevent further damage.
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Water dripping from your RV AC—inside the rig or from the roof—means condensate isn't draining properly. The evaporator coil removes humidity from the air; that moisture collects in a pan and should drain outside. When the drain is blocked or the pan overflows, you get leaks. The reader should feel instantly understood.
Quick safety check: Water near electrical components is a shock risk. Turn off the AC before inspecting. Check for ice—if the evaporator was frozen and is now melting, that's a different cause. See RV AC freezing up.
The 3 most common causes: (1) Clogged condensate drain or drain line, (2) Disconnected or kinked drain hose, (3) Frozen evaporator melting (ice buildup then thaw).
| Symptom | Most Likely Cause | Fix |
|---|---|---|
| Water dripping inside when AC runs | Clogged drain, disconnected hose | Clear drain, reconnect hose |
| Water after AC was off (thaw) | Frozen evaporator melted | See freezing up—fix airflow |
| Water from roof/outside | Drain line routed wrong, overflow | Route drain outside, clear blockage |
| Musty smell with leak | Standing water, mold in pan | Clean pan, clear drain, sanitize |
Condensate forms when warm, humid air passes over the cold evaporator coil. The water collects in a pan and drains through a tube. Algae, dirt, and debris can clog the drain. A disconnected or misrouted hose lets water pool. If the evaporator freezes (dirty filter, low refrigerant), when it thaws the sudden melt can overflow the pan. See RV AC freezing up for airflow causes.
Rooftop units are exposed to leaves, pollen, and insects. The drain opening is a common blockage point. Annual cleaning of the drain and pan prevents most leaks.
| Fix | Cost | Difficulty |
|---|---|---|
| Clear drain, reconnect hose | $0 | Easy |
| Clean evaporator/pan | $0–$50 | Moderate |
| Replace drain line | $10–$30 | Easy |
| Pro service (refrigerant, coil) | $150–$400+ | Pro |
If the drain is clear and water persists, or you suspect refrigerant issues (low charge causes freeze-thaw), a licensed HVAC technician can diagnose. Request local RV AC service below. See our RV AC not cooling guide for the full diagnostic flow.
RV AC Freezing Up · RV AC Not Cooling · RV AC Maintenance Schedule · RV HVAC Hub · Water Systems (for heater, pump, tank issues)
Usually a clogged condensate drain or disconnected drain hose. Clear the drain, reconnect the hose, and ensure the unit is level. See <a href="/rv/hvac/rv-ac-freezing-up">RV AC freezing up</a>—ice melt can also cause sudden dripping.
Water near electrical components is a shock risk. Turn off the AC before inspecting. Standing water can cause mold. Fix the drain promptly.
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If you're diagnosing RV electrical or appliance problems, these guides may help:
RV AC Troubleshooting Flowchart | RV Air Conditioner Upgrade | RV Mini Split Air Conditioner | RV Mini Split Installation | Best Mini Split for RV | RV Mini Split Solar Power | Rooftop AC vs Mini Split | RV AC Not Cooling | RV AC Running But Not Cooling Enough | RV AC Airflow Problems | RV AC Hard Start Capacitor Guide | When to Replace RV AC vs Mini Split | RV AC Compressor Failure Symptoms | RV AC Freezing Up | RV AC Short Cycling | RV AC Leaking Water | RV AC Fan Running But No Cold Air | RV AC Compressor Not Starting | RV AC Capacitor Failure | RV AC Capacitor Replacement | How To Test RV AC Capacitor | How To Test RV AC Voltage at Unit | How To Clean RV AC Evaporator Coils
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Last updated: March 2026 · Reviewed for technical accuracy