There are few things more frustrating than turning on your evaporative air conditioner on a hot Perth day only to discover it’s blowing warm air instead of cool air.
Fortunately, in many cases the problem can be identified and repaired without replacing the entire system.
At Air Legends, we regularly diagnose evaporative air conditioning faults throughout Perth and have found several common reasons why a system may stop cooling effectively.
If your evaporative cooler is running but not cooling, here’s what may be causing the problem.
How Evaporative Cooling Works
Evaporative air conditioners cool your home by drawing warm outside air through water-saturated filter pads.
As air passes through the wet pads, it cools naturally before being distributed throughout the house.
For this process to work correctly, your system requires:
- Water entering the unit
- Working water pump
- Healthy filter pads
- Proper airflow
- Functional controls
If any of these components fail, cooling performance can suffer.
Stuck Or Faulty Solenoid Valve
One of the most common evaporative cooling faults involves the water solenoid valve.
The solenoid controls water entering the unit.
If the solenoid becomes stuck or fails electrically:
- Water may not enter the system
- Filter pads remain dry
- Cooling performance disappears
In many cases, the fan will continue operating normally while the air remains warm.
Fortunately, solenoid replacement is often a straightforward repair.
Faulty Water Pump
Another common cause of poor cooling is a failed water pump.
The pump circulates water throughout the evaporative cooler and distributes it across the filter pads.
If the pump stops operating:
- Airflow may appear normal
- The fan continues running
- Cooling performance disappears
Many homeowners describe the symptom as:
“The system feels like a fan but isn’t producing cold air.”
This is often one of the first things we check during a service call.
Float Valve Problems
The float valve controls the water level inside the reservoir tank.
If the float becomes stuck or damaged:
- Water levels may become incorrect
- Cooling performance may reduce
- Water distribution may become inconsistent
A faulty float valve can sometimes create symptoms that resemble other cooling faults.
Filter Pads Full Of Sludge
Filter pads play a major role in cooling performance.
Over time they can become contaminated with:
- Sludge
- Mineral scale
- Dirt
- Organic material
When heavily blocked, airflow and cooling efficiency both suffer.
Older filter pads may also hold excess moisture and contribute to uncomfortable humidity inside the home.
In many situations, filter pad replacement can significantly improve cooling performance.
Excess Humidity Inside The Home
Evaporative cooling works best when fresh air can move freely through the house.
If windows and doors remain closed, humidity can build up indoors.
Combined with heavily soiled filter pads, homeowners may notice:
- Reduced cooling
- Humid air
- Stuffy conditions
- Uncomfortable indoor temperatures
Ensuring adequate airflow throughout the home is essential for effective evaporative cooling.
Lack Of Regular Maintenance
Many evaporative cooling systems operate for years without servicing.
Unfortunately, this often allows small issues to develop into larger problems.
During annual servicing we commonly identify:
- Pump issues
- Solenoid faults
- Drain valve problems
- Worn filter pads
- Water distribution faults
Regular maintenance helps keep the system operating efficiently throughout summer.
When Should You Call A Technician?
You should consider booking a service if:
- The system is blowing warm air
- Cooling performance has noticeably reduced
- Air feels humid or stale
- The unit has not been serviced recently
- Water does not appear to be circulating correctly
Many cooling problems can be repaired before they lead to complete system failure.
Can The Problem Be Fixed?
In most cases, yes.
Many evaporative cooling faults involve replaceable components such as:
- Solenoids
- Pumps
- Float valves
- Filter pads
- Controllers
A professional inspection can identify the cause and determine the most cost-effective repair solution.
Need Evaporative Air Conditioning Repairs In Perth?
If your evaporative air conditioner is running but not cooling, Air Legends can help diagnose the fault and recommend the best solution.
We service and repair Coolbreeze, Breezair, Bonaire, Braemar and other evaporative cooling systems throughout Perth.
Whether the problem is a faulty pump, stuck solenoid, worn filter pads or another issue, our experienced technicians can help restore cooling performance before the next heatwave arrives.
Stay Scam Safe
Always use a licensed and insured contractor when servicing roof-mounted evaporative cooling systems.
If in doubt, ask for licence details and proof of insurance before work begins.
Contact Air Legends today to arrange an evaporative air conditioning service or repair.