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Power & Electrical Cases

Real cases of aircon electrical faults — breaker trips, error codes, PCB failures, and startup issues.

Power and Electrical Problems We Have Diagnosed

Electrical faults range from a tripped isolator switch to a failed PCB or compressor drawing excessive current. The symptom — unit won't start, keeps shutting off, or throws an error code — rarely points directly to the failed component without testing.

These cases walk through how we traced each electrical fault from symptom to root cause, and why the first assumption was often wrong.

All Cases

31 real faults we diagnosed and resolved on site.

Aircon Auto Mode Shutting Off, Faulty Sensor

Jurong East · HDB · Daikin

Aircon Breaker Trips During Rain

Changi · Landed · Mitsubishi Electric

Aircon Breaker Trips, Short Circuit Found

Toa Payoh · HDB · LG

Aircon Capacitor Fix Saved Full Replacement

Fernvale · HDB · Samsung

Aircon Ceiling Unit Shutdown, Loose Terminal

Singapore River · Office · Daikin

Aircon Compressor vs Capacitor Failure

Jurong West · HDB · Panasonic

Aircon Corroded Isolator Tripping Unit

Sungei Kadut · Industrial · Panasonic

Aircon Daikin U4 PCB Failure, Lightning Surge

Pasir Ris · HDB · Daikin

Aircon Error After Power Surge, PCB Reset

Tuas · Industrial · Panasonic

Aircon Error After Servicing, PCB Reset

Marina East · Condo · Samsung

Aircon Error, Loose Sensor Wire

Bidadari · Condo · Daikin

Aircon Flashing Light After Renovation

Serangoon · HDB · Mitsubishi Electric

Aircon LG CH05 Communication Error, Corroded Terminal

Ang Mo Kio · HDB · LG

Aircon LG CH05 Outdoor PCB Failure, System-4

Tampines · Condo · LG

Aircon Mitsubishi E6 Corroded Junction Box

Yishun · HDB · Mitsubishi Electric

Aircon Mitsubishi E6 Drain Pump Interference

Bishan · Condo · Mitsubishi Electric

Aircon Mitsubishi E7 Starmex Board Failure

Punggol · HDB · Mitsubishi Electric

Aircon Not Starting Capacitor Fix

Outram · HDB · LG

Aircon Outdoor Unit Not Running

Punggol · HDB · Daikin

Aircon Panasonic H11 Communication Error, Loose Terminal

Bedok · HDB · Panasonic

Aircon Panasonic H11 Outdoor PCB Failure

Hougang · Condo · Panasonic

Aircon PCB Fault, Not Capacitor

Jurong East · HDB · Mitsubishi Heavy Industries

Aircon Post-Renovation Error, Miswired Cable

Tengah · HDB · Daikin

Aircon Remote Fault, Outdoor PCB Issue

Pasir Ris · HDB · Sharp

Aircon Samsung E1 Communication Error, Damaged Cable

Jurong West · HDB · Samsung

Aircon Samsung E1 Indoor PCB Relay Failure

Sengkang · Condo · Samsung

Aircon Sharp Error 7-0 Capacitor, Not Compressor

Bedok · Condo · Sharp

Aircon Shutdown, Thermistor Drift

Cashew · Condo · Mitsubishi Electric

Aircon System-4 Indoor Fault Trips Outdoor

Buona Vista · Condo · Midea

Aircon Thermistor Fault, Not PCB

Siglap · Landed · Mitsubishi Electric

Aircon York E1 Communication Error, Corroded Terminal

Jurong East · HDB · York

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