How to Fix Common Keystone RV Air Conditioner Problems?

Navigating through summer travels with your Keystone RV can be a delightful experience. Unfortunately, encountering Keystone RV air conditioner problems can put a damper on your journey.

Regular maintenance is crucial to keep your AC operating optimally. Potential issues encompass clogged filters, refrigerant leaks, water seepage, malfunctioning thermostats, impaired compressors, and capacitors. Engaging a professional for thorough inspections and necessary repairs is recommended to ensure your system’s effective functioning.

The guide aims to spotlight prevalent issues related to the Keystone RV air conditioner and potential solutions.

Keystone RV Air Conditioner Problems

10 Common Problems with Keystone RV Air Conditioners and Their Possible Solutions:

Uncover common issues encountered with Keystone RV air conditioners. Explore solutions to ensure a seamless and comfortable journey from cooling glitches to malfunctions.

Problem 01: Dirty or Clogged Filter

A primary factor that might lead to the improper functioning of the Keystone RV air conditioner is a dirty or obstructed filter. The filter significantly ensures the airflow remains clean and free from pollutants and dust particles. 


To determine if the filter is dirty, examine it to check if any light can pass through. If not, it’s important to have it cleaned promptly.

Following the manufacturer’s guidelines and suggestions regarding the frequency of filter changes is recommended. Some manufacturers advise monthly or quarterly replacements, while others offer reusable filters that need regular cleaning.

Problem 02: Refrigerant Leaks 

The air conditioning system utilizes refrigerant to cool the air. When leaks in the coolant, the AC’s functionality is compromised, leading to potential temperature fluctuations. Additionally, these leaks are environmentally harmful.


The initial step involves identifying the source of the leak, which plays a role in estimating the repair expenses. 

Therefore, having your AC inspected annually by a qualified technician is recommended. For minor leaks, topping up the refrigerant might suffice. In more significant cases, replacing the entire network could be necessary.

Problem 03: Malfunctioned Thermostat

A thermostat is integrated into an air conditioning unit to regulate the desired temperature. Malfunctions in the thermostat can stem from accumulated dust, corrosion, or drained batteries.


Ideally, thermostats need to be operational, clean, and properly aligned. They should also be shielded from direct sunlight and adjusted to the appropriate settings. 

Another underlying issue likely exists if AC problems persist despite addressing the thermostat. In the case of a battery-powered thermostat, assessing the battery condition is a prudent step.

Read Also: RV AC Unit Humming But Fan Not Running – Why & How To Fix?

Problem 04: Water Leaks

Similar to the filter, the drain line can become obstructed by dirt, lint, or dust. This blockage causes the drain pan to fill up, leading to water leakage. 

This situation has the potential to harm the entire AC system. Whenever water leaks from an AC unit, it’s a clear sign that maintenance is required.


Water leakage is a prevalent issue with AC units. A professional technician can address it, or you can opt for a do-it-yourself solution at home. 

Using a wet or dry vacuum to clear the pipe and utilizing vinegar to eliminate algae growth are effective DIY methods for resolving the problem.

Problem 05: Defective Compressor

The compressor is a vital element within any air conditioning system. It assists the refrigerant in facilitating heat exchange and managing pressure within the AC. 

Factors such as insufficient lubrication, coil dirt buildup, or fluctuations in refrigerant levels can lead to compressor failure.

When you notice reduced airflow from your HVAC system or your AC is struggling to provide adequate cooling, a malfunctioning compressor might be the cause.


Seeking assistance from a nearby air conditioning service is recommended to address the issue. In more severe cases of damage, replacing the compressor might be necessary. 

Problem 06: Frozen Evaporator Coils

When your AC isn’t functioning as it should, a potential cause could be a frozen evaporator coil. Accumulated dirt on the coils can impede airflow, preventing warm air from reaching the refrigerant. Consequently, the coils become excessively cold, leading to moisture freezing.


To address this issue, it’s essential to diagnose the problem and proceed with defrosting the evaporator coil. This can be accomplished by disconnecting the power for at least 24 hours.

Read Also: How to Solve RV AC Clicks But Won’t Turn On Problem?

Problem 07: Capacitor Problem

If you observe your Keystone RV AC rapidly cycling on and off, often accompanied by a clicking noise, this typically signals a problem with the capacitor. 

The capacitor plays a crucial role in providing the initial boost to the motor for its operation. Particularly during the intense heat of summer, capacitors can be prone to overheating.


It’s recommended to have the capacitor inspected by a qualified technician. Attempting to address this concern independently is discouraged due to the potential risk of electrical shock.

Problem 08: Fuses or Circuit Breakers

Circuit breakers and fuses are used to prevent the AC’s motor and compressor from overheating. Typically, when the motor ceases to function, the breaker is one of the primary components to examine.

When encountering these scenarios, begin by inspecting and cleaning the air filter. If it’s found to be damaged, consider replacing it.


Maintain your air conditioner and schedule regular inspections consistently. It will be helpful in mitigating the likelihood of such problems arising in the future. Ignoring such issues raises the potential for significant harm to the circuit breaker and the air conditioning system.

If you possess limited knowledge of technical devices, it’s advisable to seek professional assistance. Detecting and resolving this problem could be challenging for someone unfamiliar with the technology.

Problem 09: Frequent On-and-Off Cycling of the AC

Periodic short cycling of the air conditioning system can occur. When it becomes a frequent issue, it becomes a cause for concern.

The culprit might be the connection cables, which could stretch, loosen, and disrupt the fan’s operation within the air conditioning system. This disconnection can lead to the AC shutting down.

Additionally, a damaged control board might result in the air conditioner continuously cycling on and off. Identifying all the intricacies of a faulty control board can be pretty challenging.


Do not disregard this situation, even if it happens only occasionally. To pinpoint the exact cause, carefully refer to and comprehend the instruction manual provided by Keystone RV.

If the issue lies with the connecting cable, it’s likely due to expansion with temperature changes, leading to loosening. Replacing the old wires with temperature-resistant ones is advisable.

Since problems related to malfunctioning circuit boards are complex to diagnose and can lead to such issues, seeking professional expertise is crucial.

Read Also: RV AC Soft Start Vs Easy Start Kit | Which One is Worth it?

Problem 10: AC Emits Warm Air

The sensation of warm air flowing from the ceiling could stem from frozen evaporator coils. Similarly, irregular fan speeds might release warm air from the top. Even minor ceiling cracks can contribute to the issues. 


Examining the ceiling and ducting for cracks. Take a close look at your frozen evaporator coils, as neglect and lack of maintenance might lead to wear over time.

Check for signs of wear in your frozen evaporator coils due to the passage of time and potential neglect. If needed, consider replacing the frozen evaporator coil.


Why is my Keystone RV AC not turning on?

Several factors could cause your Keystone RV AC not to turn on, such as a tripped circuit breaker, a faulty thermostat, or a disrupted power supply. Check these components, ensure proper connections, and verify the thermostat settings. If the issue persists, seeking professional assistance may be necessary.

Why is my Keystone RV Air Conditioner not cooling?

Your Keystone RV AC may not be cooling due to dirty air filters, blocked condenser coils, low refrigerant levels, or a malfunctioning compressor. Ensure filters and coils are clean, and if problems persist, consider contacting a professional to diagnose and address the underlying cause.

How can I make my Keystone RV air conditioner work better?

To enhance your Keystone RV air conditioner’s performance, keep filters and coils clean, ensure proper ventilation around the unit, shade it from direct sunlight, and seal any gaps in the RV to minimize heat infiltration. Regular maintenance, timely repairs, and window shades can also improve efficiency.

Sum Up

RV air conditioners are vital, providing relief from harsh outdoor conditions. Regular maintenance is essential, yet unavoidable Keystone RV air conditioner problems might emerge with frequent use.

This comprehensive guide offers solutions to these common problems, aiding you in effectively addressing them and maintaining your AC for smoother operation.

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