How to Diagnose and Fix RV Air Conditioner Problems.

An RV air conditioner is essential for staying comfortable in your RV. When it stops working, the sweltering heat can quickly dampen the fun and ruin everyone’s time. Fortunately, with a bit of troubleshooting, you can identify common problems and even resolve some of them on your own. Here’s a guide to diagnosing and fixing RV air conditioner problems no matter the brand. (most common are dometic & coleman units on rv’s).

Common RV Air Conditioner Issues

We will get to solutions to these problems below, but it’s important to recognize the most common problems that RV air conditioners encounter:

1. Unit Won’t Turn On:

   • Causes include power supply issues at the hookup or pedestal, tripped breakers, or faulty wiring. If you are trying to run an AC off of a normal household outlet, this will only work if you can ensure your AC is not pulling more then 20 amps. RV units pull on average around 23 up to 30 amps on a hot day. Soft starts can be installed on most A/C units to allow for use on a 20 amp household outlet. (we can and would be happy to install a soft start kit for you).

2. Weak Airflow:

   • Often due to dirty filters, obstructions, or blower motor problems. Some HEPA filters can cause too much obstruction and weaken airflow and efficiency.

3. Air Isn’t Cooling:

   • This could indicate a refrigerant leak, compressor issue, or dirty evaporator coils. Very rare that this actually happens. If it does, it is time for a new unit.

4. Unusual Noises:

   • Causes range from loose parts to a failing fan motor or damaged compressor. These fan blades in the unit are plastic, they will break, chip or lose fins sometimes.

5. Water Leaks Inside the RV:

   • Usually caused by clogged drain lines or improper installation. Condensation off of the air conditioner coils can roll right inside the rv through a failed AC gasket.

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Troubleshooting Your RV Air Conditioner

Follow these steps to identify and potentially fix the problem:

1. Check the Power Supply:

   • Ensure your RV is properly connected to shore power (sufficient amperage) or your generator is functioning. Inspect the circuit breaker panel for tripped breakers and reset if necessary. Do not keep resetting a tripped breaker, there is likely a reason for the trip.. (don’t be that guy).

   • Remember that RV air conditioners use both 12V and 120V systems. The 12V system powers the thermostat and control board, while the 120V system powers the compressor and fan. Confirm both systems are receiving the correct input voltage. In simplified terms.. Make sure your battery is in good shape. If it is a serviceable lead acid battery, verify that your cells are full with distilled water only. This is so important and a very neglected part of an RV’s electrical system.

2. Inspect the Filters:

   • Dirty filters block airflow, reducing efficiency. Remove and clean the filters or replace them if they’re worn out. Some HEPA filters are too thick to allow for the AC to work at its most efficient rate.

3. Examine the Thermostat:

   • Make sure your thermostat is set to the correct mode and temperature. Check for loose wiring connections at the back of the thermostat. Loose wires can cause communication issues where your thermostat is on, but it is not sending power to your AC. We have seen this many times.

4. Inspect the Exterior Unit:

   • Clear any debris from the AC unit on your RV’s roof. Ensure the condenser coils are clean and free of obstructions. A good practice is to use an electric leave blower, with caution and care, to blow dust and dirt off of the A/C unit internals. We like this Milwaukee blower and use it on jobs where we clean the A/C Coils. While you’re on Amazon, pickup some coil cleaner while you are there!

5. Listen for Unusual Sounds:

   • Rattling or buzzing noises can indicate loose components or a failing fan motor or blower wheel.

6. Look for Water Leaks:

   • If water is leaking inside, inspect the drain pan on the roof and drain lines for blockages. Clean the drainage paths thoroughly to restore proper drainage out of the A/C pan and off of the RV’s gutter spouts usually found on the corners. Some Class-A coaches have a drainage system that travels down through the RV interior and down a condensation line. These can and will get clogged.

7. Test the Compressor:

   • If your unit blows air but doesn’t cool, the compressor may be failing or the refrigerant level may be low. This requires professional attention to diagnose. In the case of a bad compressor, be prepared for a new unit.

8. Most Troubleshooting Happens Inside:

   • The diagnostic steps can be performed inside your RV. Starting with the thermostat and inspecting the connections. Next would be checking inside the A/C garnish by removing the cover and filters. The control box is found inside this area and all the troubleshooting can be done by pulling out the control box. To test the compressor if needed, that is when we would need to pull out the ladder and get inside the unit from the roof.

When to Call a Professional

Some issues, like a faulty compressor or refrigerant leaks, require specialized tools and expertise to give an accurate diagnosis. If your troubleshooting doesn’t resolve the problem, it’s time to call in the experts.

At Odyssey Mobile RV Repair, we’ve helped countless RV owners along Washington’s I-5 corridor to diagnose and repair their air conditioners. Whether you’re in Skagit County or further south, we’re here to ensure your comfort on the road.

Submit your service request now for professional air conditioner repairs.

Tips for Preventing Future Problems

1. Perform Regular Maintenance:

   • Clean or replace air filters monthly during heavy use.

   • Inspect the condenser and evaporator coils regularly.

2. Keep the Unit Clean:

   • Ensure no debris accumulates on or around the exterior unit.

3. Schedule Annual Inspections:

   • A professional cleaning and tune-up can catch issues before they become major problems.

4. Monitor Power Usage:

   • Avoid overloading your electrical system to prevent damage to the air conditioner. Consider using a surge protector.