Power & Electrical Problems
Aircon cannot start, keeps turning off, trips the breaker, or shows flashing lights. Understand likely electrical causes and when to call a technician.
Why Your Aircon Will Not Turn on or Keeps Shutting Off
Power and electrical issues range from minor (dead remote batteries, tripped isolator) to serious (compressor failure, wiring fault). Before assuming the worst, check the basics: is the isolator switch on? Is the circuit breaker tripped? Has the remote run out of batteries? These account for a surprising number of service calls.
If the unit starts but shuts off after a few minutes, it is likely short cycling. This happens when the compressor overheats due to restricted airflow, low refrigerant, or a failing capacitor. The unit's protection circuit shuts it down to prevent damage, then it restarts once cooled — creating a start-stop-start loop.
A breaker that trips repeatedly when the aircon runs is a safety concern. It could indicate a wiring fault, a failing compressor drawing excessive current, or an overloaded circuit shared with other appliances. Do not keep resetting the breaker — have the circuit inspected by a qualified technician.
Related Problems
Each article covers a specific symptom — what causes it, how serious it is, and when it needs professional attention.
Recent Cases
Real faults we diagnosed and resolved on site — what the owner reported, what we actually found, and how it was fixed.
Aircon Auto Mode Shutting Off, Faulty Sensor
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Aircon Breaker Trips During Rain
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Aircon Breaker Trips, Short Circuit Found
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Aircon Capacitor Fix Saved Full Replacement
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Aircon Ceiling Unit Shutdown, Loose Terminal
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Aircon Compressor vs Capacitor Failure
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Aircon Corroded Isolator Tripping Unit
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Aircon Daikin U4 PCB Failure, Lightning Surge
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Aircon Error After Power Surge, PCB Reset
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Aircon Error After Servicing, PCB Reset
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Aircon Error, Loose Sensor Wire
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Aircon Flashing Light After Renovation
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Aircon LG CH05 Communication Error, Corroded Terminal
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Aircon LG CH05 Outdoor PCB Failure, System-4
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Aircon Mitsubishi E6 Corroded Junction Box
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Aircon Mitsubishi E6 Drain Pump Interference
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Aircon Mitsubishi E7 Starmex Board Failure
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Aircon Not Starting Capacitor Fix
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Aircon Outdoor Unit Not Running
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Aircon Panasonic H11 Communication Error, Loose Terminal
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Aircon Panasonic H11 Outdoor PCB Failure
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Aircon PCB Fault, Not Capacitor
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Aircon Post-Renovation Error, Miswired Cable
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Aircon Remote Fault, Outdoor PCB Issue
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Aircon Samsung E1 Communication Error, Damaged Cable
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Aircon Samsung E1 Indoor PCB Relay Failure
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Aircon Sharp Error 7-0 Capacitor, Not Compressor
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Aircon Shutdown, Thermistor Drift
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Aircon System-4 Indoor Fault Trips Outdoor
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Aircon Thermistor Fault, Not PCB
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Aircon York E1 Communication Error, Corroded Terminal
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