Troubleshooting Your Airxcel 48000 Series Air Conditioner – A Complete Guide

Are you having issues with your Airxcel 48000 series RV air conditioner? As a popular and reliable AC unit for RVs, the 48000 series may occasionally run into problems. Don’t sweat – this troubleshooting guide will walk you through the most common Airxcel 48000 series issues and how to diagnose and fix them yourself.


As an RV owner, keeping your air conditioning unit in good working order is essential during the warm summer months. Nothing can ruin a camping trip faster than an AC that won’t blow cold air on a hot day!

The Airxcel 48000 series is a ducted air conditioner commonly found in many types of RVs including motorhomes, fifth wheels, and travel trailers. The 13,500 BTU and 15,000 BTU models provide reliable cooling and ventilation.

But like any complex system, air conditioners can develop problems. Thankfully, many 48000 series issues can be identified and repaired with some basic troubleshooting.

In this guide, we’ll cover:

  • Common Airxcel 48000 series problems
  • Step-by-step troubleshooting tips
  • Repair and maintenance recommendations

Equipped with this helpful information, you’ll be prepared to tackle any 48000 series air conditioner issues and keep your RV cool for all your summer adventures.

Common Airxcel 48000 Series Problems

common airxcel 48000 series problems
Common Airxcel 48000 Series Problems

Here are some of the most frequently reported Airxcel 48000 series air conditioner problems:

1. Unit Won’t Turn On

If your AC unit does not power on at all, there are a few parts to inspect:

  • Fuse or Breaker: Check the fuse box or breaker panel for a tripped fuse or flipped breaker switch. Reset if needed.
  • Power Cord: Verify the power cord is undamaged, firmly plugged into the outlet, and that the outlet is receiving electricity.
  • Control Panel: Check if the control panel is getting power. If not, test the control board fuse.
  • Compressor: Use a multimeter to test voltage at the compressor. If none, the start capacitor could be bad.
  • Control Board: No power at the control board points to a failed control board.
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2. Fan Works But No Cool Air

If the indoor fan runs but cool air is not blowing, there may be an issue with:

  • Compressor: The compressor clutch may be bad or the compressor itself failed. Use a multimeter to test.
  • Refrigerant Lines: Check for leaks or blockage in the refrigerant lines preventing refrigerant flow.
  • Capacitors: Failed start or run capacitors can prevent the compressor from running. Test with a multimeter.
  • Thermistors: Malfunctioning thermistors affect the compressor cycling. Test continuity.
  • Control Board: The board may not be sending voltage to the compressor. Inspect the board.

3. Short Cycling (Compressor Rapidly Turns On/Off)

Frequent short cycling of the compressor is often due to:

  • Dirty Filters/Coils: Clean filters allow proper airflow. Clean coils allow heat transfer efficiency.
  • Refrigerant Charge: Too little refrigerant causes short cycling. Check for leaks and recharge if needed.
  • Thermistor Problems: Defective thermistors provide inaccurate readings to the control board. Test thermistor continuity.
  • Compressor Valves: Bad valves prevent proper refrigerant flow and lead to short cycling. Replace faulty valves.
  • Control Board: The board could be faulty and causing abnormal compressor cycling. Test the board.

4. Frozen Evaporator Coil

If the evaporator coil frosts or freezes up, common causes are:

  • Dirty Air Filter: Change out soily air filters to improve airflow over the coil.
  • Low Refrigerant: Not enough refrigerant flowing can lead to freezing. Check level and recharge if needed.
  • Bad Thermistors: Faulty thermistors give inaccurate readings and disrupt unit operation. Test thermistor continuity.
  • Blown Fuse: Check control board fuse which protects the evaporator fan circuit.
  • Bad Evaporator Fan: Replace the fan if it is not circulating air properly over the coil.

5. Water Leaking

Water leaking inside the RV from the AC is often due to:

  • Clogged Drain Line: Clear debris from the condensate drain line so water can exit.
  • Drain Pan: Check for cracks or rust holes in the drain pan allowing water to overflow.
  • Plumbing Leak: Inspect refrigerant and condensate lines along with the evaporator coils for leaks.
  • Roof Gasket: Replace the gasket seal if it is cracked or missing allowing water intrusion.
  • Condensate Pump: The pump may not be working properly to pump out excess condensate. Test pump operation.

Step-by-Step 48000 Series Troubleshooting

Now let’s dive into the key steps for diagnosing your Airxcel air conditioner issues:

Safety First

  • Turn off power to the AC unit at the breaker before doing any troubleshooting or repairs.
  • Never stick hands or tools into a running AC component.
  • Wear insulated gloves when testing high voltage parts like the compressor.
  • Ensure wires are disconnected before testing capacitors which can hold dangerous charges.
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1. Gather Symptom Information

  • Take note of any visual clues like frost/ice buildup, leaks, or damage.
  • Document when issues occur like on startup or during certain conditions.
  • Note ambient temperatures when problems arise.
  • Check error codes on digital control boards.
  • Listen for abnormal sounds from the unit when running.

2. Check Power Supply

Use a multimeter or voltmeter to check:

  • Voltage at the outlet and power cord – should have 110-120VAC.
  • Voltage at the control board – should have 12-14VDC from transformer.
  • Control panel fuse – test continuity.

Issues with power supply point to electrical problems like bad wiring, fuses, transformer, or circuit board.

3. Inspect Airflow

Good airflow is needed for the AC system to operate efficiently.


  • Return air filter – clean or replace if soily.
  • All air vents – clear any blockages.
  • Blower fan operation and speeds.
  • Evaporator coil – clean if excessively soily.

Fan, vent or coil issues can reduce cooling performance.

4. Assess Refrigerant Charge

Low refrigerant levels can significantly affect cooling capabilities.


  • Refrigerant pressure gauge readings – should be in spec.
  • Line temperatures – should show proper hot/cold cycle flow.
  • For leaks near connections through bubbles with soap test.
  • Thermistors and pressure switches that affect refrigerant flow.

Recharge refrigerant if low. Repair any leaks detected.

5. Check Capacitors

Bad capacitors are a common cause of compressors not starting properly.

  • Test microfarad values with a capacitor meter – should be in 5% spec.
  • Visually inspect for bulging or leaking oil.
  • Test continuity – should show open circuit when discharged.

Replace any out-of-spec, bulging or leaking capacitors.

6. Evaluate Control Board

The control board oversees the AC unit operation.


  • Input voltage and fuse.
  • Outputs to compressor and fan motors during operation.
  • Fault code history.
  • Settings compared to thermistors and switches.

Replace control board if found to be faulty.

7. Monitor Compressor Operation

The compressor pumps refrigerant through the system.


  • Wiring for power and continuity.
  • Start sequence and current draw during operation.
  • Voltage and resistance values of windings.
  • Compressor clutch and contact voltage.

If compressor is faulty, replacement may be required.

Key Airxcel 48000 Series Repairs

key airxcel 48000 series repairs
Key Airxcel 48000 Series Repairs

The most common unit repairs include:

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Refrigerant Recharge: Using gauges to check pressure and an AC recharge kit to top off refrigerant levels. Fix any leaks.

Capacitor Replacement: Discharge old capacitor fully before removing. Install new capacitor of same spec.

Control Board Swap: Unplug wiring harness and replace circuit board with updated revision.

Compressor Swap: Reclaim old refrigerant. Remove bad compressor and install new unit with oil. Evacuate lines and recharge with refrigerant.

Thermistor Changeout: Unplug and remove faulty thermistor from coil or line. Apply thermal paste to replacement and reinstall.

Condensate Pump Fix: Clear pump intake tube and filter screen. Check power to pump. Replace failed pump if needed.

Ducting Repair: Reattach separated ducts with sheet metal screws. Use foil tape to seal leaking joints.

Filter Dryer Install: Cut into refrigerant line and install in-line liquid line filter to remove debris and moisture.

Preventative Maintenance

Regular maintenance can prevent many AC problems and keep your unit running efficiently. Follow these tips:

  • Annually clean evaporator and condenser coils with coil cleaner.
  • Check air filters monthly and replace as needed.
  • Keep debris and plants away from exterior unit.
  • Periodically inspect wiring, capacitors, and connections.
  • Recharge refrigerant levels once a year.
  • Cover and winterize unit before storing RV.
  • Follow all maintenance instructions per manufacturer.

Proper preventative maintenance ensures your Airxcel 48000 series air conditioner provides reliable cooling throughout the hot summer camping season!

When to Call a Professional

While many 48000 series issues can be addressed with standard troubleshooting and repairs, more complex problems may require an HVAC professional:

  • Refrigerant system leaks or damage.
  • Compressor starting issues.
  • Severe icing/freezing of evaporator coil.
  • Major component or system replacements.
  • Troubleshooting assistance if problem unresolved.
  • Certification to handle refrigerant recharging.
  • Lacking technical skill, tools, or ability to safely access equipment.

Proper air conditioner repair knowledge and EPA 608 certification is needed work on refrigeration systems. Don’t take risks trying to fix complex AC problems. Call a technician for assistance.


Having your Airxcel 48000 series air conditioner break down can really put a damper on RV trips and vacations. With this troubleshooting guide, you now have the key information needed to tackle common a/c issues on the 48000 series units.

Remember to always put safety first by disconnecting power when servicing the AC unit. Following methodical troubleshooting steps can help pinpoint the root cause of problems. Typical repairs involve cleaning coils, replacing filters and capacitors, recharging refrigerant, swapping out faulty components, and sealing duct leaks.

By performing preventative maintenance each year and addressing small problems quickly, your 48000 series air conditioner can provide many years of reliable cooling. But for major repairs or complex troubleshooting, don’t hesitate to call in a certified HVAC technician for assistance.

Stay cool out there on all your camping adventures! Proper AC maintenance is essential to enjoying the RV lifestyle. With the troubleshooting tips covered, you can keep your Airxcel 48000 series running great all summer long.

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