Rainy-day breaker trips traced to water ingress in switch box
Aircon case in Pasir Ris, Singapore: electrical/control traced to rusty outdoor switch box with water entry after targeted diagnosis checks.
Case details
What client reported
The breaker often tripped during rainy evenings. On dry days, the system could run for long periods without fault.
What we found
Rain-linked trips often point to water entry in the power path. We checked each point in order.
- Compressor winding checks were normal
- Trips matched wet weather periods
- Outdoor switch box had rust and worn seals
- Trip happened again when moisture reached the switch area
Water entered the outdoor switch box and created a leak-to-ground path. The breaker tripped to protect the circuit. The compressor was not the cause.
What we did
We replaced the damaged switch box and improved weather seals at cable entry points. No compressor replacement was needed.
Trips stopped after switch-box correction. System operation stayed stable through rainy periods.
Timeline
Day 1
Repeated breaker trips during wet weather
Day 1
We checked the switch box under wet conditions and saw the same trip pattern again
Day 1
Isolator fault confirmed and corrected
What we learned
Why rain-linked trips are often an external electrical-path issue.
- If trips cluster around wet weather, check outdoor switches and entry seals before blaming the compressor.
- A compressor fault usually appears across all weather, not mainly during rain.
- Testing the power path under wet-condition simulation can isolate the true source quickly.
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