Don’t wait for the heat to hit — spot the warning signs early
Your RV’s rooftop air conditioner is one of the most important systems when it comes to comfort on the road, especially during California summers. But like any mechanical component, it wears down over time, and knowing the signs of trouble can help you avoid a full breakdown when you need cool air the most.
Here are the most common signs your RV AC needs service — and when to call a mobile RV repair technician.
1. Weak or No Airflow
If it feels like your AC’s just not blowing like it used to, you’re probably right.
Low airflow can be caused by:
- A dirty or clogged air filter
- Blocked return vents or ducts
- Failing blower motor or capacitor
- Ice buildup inside the unit
What to do: Start by cleaning the filter and checking the airflow. If there’s no improvement, it’s time to have the fan motor and internal components professionally inspected.
2. Warm Air Instead of Cool
You’ve set it to cold… but it’s blowing warm or room-temperature air.
This often signals:
- Low refrigerant (possibly from a leak)
- Dirty condenser or evaporator coils
- Compressor failure
- Thermostat malfunction
Pro Tip: Rooftop ACs are sealed systems — so if refrigerant is low, it usually means a leak. This requires specialized repair from a certified RV technician.
3. Loud or Unusual Noises
RV ACs aren’t silent, but they shouldn’t sound like a helicopter either.
Listen for:
- Rattling or clanking (loose components)
- Buzzing or humming (electrical issues)
- High-pitched squeals (fan or motor bearings)
Ignoring these noises can lead to larger failures down the road.
4. Water Leaking Inside the RV
You notice dripping water near vents or along the ceiling.
This could be due to:
- A clogged drain pan or blocked condensate line
- Improperly installed or sealed unit
- Ice buildup melting into the RV interior
Important: Water damage spreads fast. If you see signs of internal leaking, shut off the unit and schedule a mobile AC inspection right away.
5. Your RV AC Smells Strange
Odors are a red flag that something is building up inside the unit.
Common culprits:
- Mold or mildew on the coils
- Dust buildup in the ductwork
- Overheated wiring (burning smell)
Regular cleanings can help prevent these issues, but if the smell is persistent or sharp, it’s best to have a pro check it out.
6. The Unit Won’t Turn On at All
If the system is totally unresponsive, check the basics — but don’t force it.
Check:
- Thermostat settings
- Circuit breaker or fuse panel
- 12V/120V power supply
- Shore power/generator output
If those are all good, the problem may lie in the control board, motor, or wiring. A qualified technician can run full diagnostics without needing to remove the unit.
What to Do If You Notice These Signs
Don’t wait until it completely fails — rooftop RV air conditioners are often repairable before they reach the point of no return.
At Murphy Mobile RV Repair, we offer on-site rooftop AC diagnostics, cleanings, and Soft Start/Easy Start installations throughout Orange County.
Whether you’re prepping for a summer road trip or trying to stay cool while parked, we’ll come to you and make sure your AC is running at peak performance.
Book Your RV AC Inspection Today
Call (714) 450-5086 or Schedule a Visit to get started.