If your Bonaire evaporative air conditioner starts normally but then shuts down after running for a period of time, there is a good chance the motor is overheating.
Motor cut-out faults are one of the more common issues found in ageing Bonaire evaporative cooling systems throughout Perth.
While electrical faults can occasionally be responsible, the problem is often related to the motor itself reaching a temperature where its internal protection system shuts it down.
Understanding why this happens can help determine whether a repair or motor replacement is required.
How A Bonaire Fan Motor Works
The fan motor is responsible for driving the fan that pushes cooled air throughout your home.
Most Bonaire systems use a horizontal-mounted AC motor that operates for long periods during Perth’s summer heat.
As the motor runs, it naturally generates heat.
To protect itself from damage, the motor contains thermal overload protection.
If the motor becomes too hot, this protection system switches the motor off until it cools down.
This often creates a cycle where:
• The cooler starts normally
• Airflow operates correctly
• The motor shuts down
• The motor cools
• The system restarts
• The fault repeats
Internal Winding Failure
One of the most common causes of motor cut-outs is a winding fault.
Electric motors contain copper windings that generate the magnetic fields required for operation.
Over time these windings can deteriorate due to:
• Age
• Heat
• Moisture
• Vibration
• Normal wear
When one winding becomes partially damaged or open circuit, the motor often works harder than normal and generates excessive heat.
Eventually the thermal protection activates and shuts the motor down.
In most cases, a motor with a winding fault requires replacement.
Overheating Motors
Even when a winding has not completely failed, motors can sometimes overheat due to general wear.
Signs include:
• Hot motor casing
• Reduced airflow
• Intermittent operation
• Burning smells
• Unexpected shutdowns
These symptoms usually indicate the motor is approaching the end of its service life.
Electrical Faults
Although less common than motor failure, electrical issues can also contribute to motor cut-outs.
Possible causes include:
• Loose wiring connections
• Faulty relays
• Damaged electrical components
• Controller faults
• Voltage supply problems
Electrical testing is often required to rule out these possibilities.
Can A Capacitor Cause Motor Problems?
Yes.
Many AC motors use a capacitor to assist with starting and running.
If the capacitor begins to fail, the motor may:
• Struggle to start
• Draw excessive current
• Run hotter than normal
• Trip thermal protection
In some cases, replacing a faulty capacitor can restore normal operation.
Restricted Airflow Can Increase Motor Load
Motors work harder when airflow is restricted.
Common causes include:
• Dirty filter pads
• Debris inside the unit
• Fan problems
• General lack of maintenance
Although airflow restrictions are not usually the primary cause of motor cut-outs, they can increase stress on ageing components.
Can A New Motor Fail?
Occasionally, yes.
Modern replacement motors are generally very reliable, but like any manufactured product, faults can occasionally occur.
If a replacement motor develops a manufacturing defect, it will often show symptoms relatively quickly after installation.
At Air Legends, replacement motors supplied by us are covered by warranty in accordance with manufacturer warranty conditions.
Should You Repair Or Replace The Motor?
This depends on:
• The age of the system
• The condition of the motor
• The cost of repair
• The overall condition of the evaporative cooler
If the motor has developed an internal winding fault, replacement is usually the most practical long-term solution.
Signs Your Bonaire Motor May Be Failing
You should arrange an inspection if you notice:
• Motor cutting out
• Weak airflow
• Burning smells
• Intermittent operation
• Unusual motor noises
• Fan stopping unexpectedly
Addressing the issue early can help avoid complete failure during summer.
Book A Bonaire Motor Inspection In Perth
If your Bonaire evaporative air conditioner motor keeps cutting out, Air Legends can inspect the system and identify the cause.
We service and repair Bonaire evaporative coolers throughout Perth and can diagnose motor faults, electrical issues, capacitor failures and airflow-related problems.
Contact Air Legends today to arrange a professional Bonaire inspection.