RV AC Leaking Water: Condensate Drain & Fixes

Water dripping inside? Clogged drain, disconnected hose, or ice melt. Step-by-step fix.

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🔎 30-Second Summary

RV AC leaking water often results from a clogged condensate drain or disconnected drain line, leading to improper drainage of moisture. It is crucial to check the drain, ensure the unit is level, and verify airflow to prevent such issues.

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System context: To understand how RV air conditioners work, see RV AC Not Cooling.

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Fast Answer: RV AC leaking water inside? Usually a clogged condensate drain or disconnected drain line. The evaporator produces condensation; if the drain is blocked, water backs up and drips. Clear the drain, check the pan, and ensure the unit is level. See RV AC freezing up—ice melt can also cause sudden dripping.

What This Problem Usually Means

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).

Quick Diagnosis Table

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

Quick Troubleshooting Steps

Step 1 – Locate the drain: Rooftop AC units have a condensate drain on the roof or side. It's a small tube or opening. Ensure it's not blocked by debris, leaves, or insect nests.
Step 2 – Clear the drain: Use compressed air, a pipe cleaner, or a small brush to clear the drain opening. Pour a small amount of water to test flow. If it backs up, the line is clogged.
Step 3 – Check the drain hose: The drain may connect to a hose that routes water off the roof. If disconnected or kinked, water pools and leaks. Reconnect and ensure it drains away from the RV.
Step 4 – Level check: If the RV is tilted, the condensate pan may not drain properly. Level the rig and retest. See freezing causes—restricted airflow can cause freeze-thaw cycles and sudden water.

🔧 Field Insight: Airflow dominance: Restricted airflow accounts for most freeze-up cases. Once ice melts, water can overflow the pan. Clean the filter first—it's the #1 preventive step for both freezing and drain issues.

Why This Problem Happens

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.

Repair Options

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

When to Call a Professional

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.

Related Guides

RV AC Freezing Up · RV AC Not Cooling · RV AC Maintenance Schedule · RV HVAC Hub · Water Systems (for heater, pump, tank issues)

Frequently Asked Questions

Why is my RV AC leaking water inside?

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.

Is RV AC water leak dangerous?

Water near electrical components is a shock risk. Turn off the AC before inspecting. Standing water can cause mold. Fix the drain promptly.

Related RV Troubleshooting Guides

If you're diagnosing RV electrical or appliance problems, these guides may help:

RV AC Troubleshooting Guides

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About the Author

Adam Hall — Founder, DecisionGrid

DecisionGrid's technical guides are written and reviewed using:

System-level electrical analysis
Real-world RV troubleshooting patterns
Manufacturer documentation review
Field-tested diagnostic workflows

Our goal: Clear, structured troubleshooting — not guesswork.

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Updated March 2026 · Reviewed for technical accuracy

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Last updated: March 2026 · Reviewed for technical accuracy

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