Aircon Case Studies
Use this category when you want evidence from similar situations before committing to scope. Each case shows the complaint, what was checked, the actual cause, and what the job actually needed. Use them to understand what a proper diagnosis looks like.
All Case Studies
Sorted alphabetically. Search by symptom, brand, or location.
Breaker trips, not compressor short
Trips and hot smell were traced to a damaged isolator connection, not compressor failure.
Cold but weak airflow
Weak airflow was traced to buildup pattern before motor replacement was considered.
Compressor vs capacitor failure
Major replacement was advised first, but targeted testing found a smaller failure.
Flashing light after renovation, not PCB replacement
Flashing errors started after nearby work because a communication-wire connection was disturbed, not because the PCB failed.
Hidden leak at Schrader valve core
A small service-port valve-core leak kept causing repeat cooling loss after quick checks missed the leak path.
Ice on pipe, not just low gas
Pipe icing followed an airflow restriction pattern, so a top-up-first fix would have missed the actual cause path.
No airflow, not fan motor replacement
Very low airflow was caused by heavy blower-wheel buildup, so a fan motor replacement would have been the wrong first fix.
Not cold after servicing
Cooling failed soon after service because one service step was incomplete.
One room not cold, not low gas
One warm room was narrowed to a room-specific indoor airflow and coil issue, not a system-wide gas problem.
Outdoor noise at night, not compressor failure
Night rattling was vibration transfer from mounting points and bracket hardware, not a failed compressor.
Outdoor unit not running, contactor relay fault
The outdoor side did not start because of a contactor relay fault, while the indoor side kept running and made the problem look bigger.
Refrigerant leak, not just low gas
Repeated top-ups were masking one leak path that needed proper repair.
Remote not working, not indoor PCB
Remote command failure was traced to the IR receiver path, not a full indoor PCB replacement case.
The refrigerant top-up loop
Three gas top-ups in one year — a leaking flare joint was the cause no one had checked.
Water leak after chemical wash
Indoor dripping started after a chemical wash because the drain path was not seated correctly during reassembly.
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