My AC isn't working — just tell me what to check. Start with your symptom below.
Pick your symptom to jump to the right diagnostic guide.
Follow the logic below to narrow down the cause. In 90% of cases: airflow restriction or low voltage.
Guides: Breaker Tripping · Thermostat · Freezing Up · Low Voltage · Capacitor
Each step links to a detailed guide. If you reach the bottom and the problem persists, a licensed technician may be required.
If your system still isn't working after these checks, the issue is likely electrical or component failure.
At this point, most RV owners call a technician.
If your RV AC compressor, capacitor, or control board has failed, a professional technician may be required.
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Same day service and emergency repairs are available. If you do not feel comfortable diagnosing 120V electrical issues, or if the compressor, capacitor, or refrigerant system has failed, professional repair is strongly recommended to avoid electrocution or permanent system damage.
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Rooftop units struggle in extreme heat and humid climates. Many RV owners upgrade to mini split systems for better efficiency and quieter operation.
See our RV mini split air conditioner guide, installation guide, best models, and solar power for full coverage. Mini splits require professional installation—electrical wiring and refrigerant work.
We connect you with local RV HVAC professionals.
Top causes: dirty filter, low voltage, frozen evaporator, capacitor failure, or refrigerant loss. Check filter first, then verify voltage (108–132V). See our RV AC not cooling for step-by-step diagnosis.
Usually capacitor failure, dirty filter, or low voltage. Fan runs but no cold air often means capacitor. See capacitor symptoms and low voltage guides.
If your compressor, capacitor, or control board has failed after DIY checks, professional diagnosis may be required. Enter your ZIP above to check for RV HVAC technicians in your area.
Yes. Mini splits offer better efficiency and quieter operation. They require professional installation. See our RV mini split air conditioner guide.
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Last updated: March 2026 · Reviewed for technical accuracy