Why Did My Aircon Start Tripping After a Service Visit?
Tripping that starts after servicing makes the recent work worth checking, but timing alone does not establish the cause. A loose connection or an unsecured cover is a possibility, not a confirmed diagnosis. Leave the circuit off for inspection.
By Team Snowflake | Updated 20 Sept 2026
Why did my aircon start tripping the breaker after a service?
- A terminal left under-tightened holds in calm conditions and fails under load.
- A protective cover left open lets moisture reach an exposed terminal.
1. A terminal left under-tightened
Trips that began after a visit, and worsen when the unit works hard or the weather turns, usually mean a terminal screw was not fully tightened when it was put back. The connection still holds in calm conditions. Under load or damp it heats, resists, and the breaker sees a fault.
How to tell
This path is a mechanical connection: rather than a cover left open, which tracks the humidity, this one trips under electrical load. Interior dryness is a technician check rather than a homeowner sign.
- The trips started only after the service or top-up visit.
- They happen under heavy load or in bad weather.
- A sharp or acrid smell lingers around the outdoor switch.
- The trips are becoming more frequent over time.
How we confirm it
The terminals that were worked on are opened and checked for tightness and heat damage. Anything discoloured is replaced, then the unit runs under load to confirm it stays cool.
Avoid running the circuit once anything smells sharp or scorched at the switch. A terminal that has begun arcing degrades every time it is re-energised, so each reset makes the repair larger.
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2. A protective cover left open
Trips that follow humid days, on a unit serviced recently, can mean a protective cover was not fully closed after a terminal was checked. That small gap lets ambient moisture settle on an exposed terminal. Once enough moisture bridges it, the breaker cuts the circuit.
How to tell
An under-tightened terminal fails under load no matter the weather; here dry days pass without trouble however hard the unit works. The trigger is moisture reaching a terminal rather than load through it.
- The trips follow humid weather rather than heavy use.
- It behaves normally on dry days.
- A cover or panel near the terminals sits slightly open.
- Nothing was wrong before the service visit.
How we confirm it
The exposed terminal is dried and inspected, then the protective cover is closed and secured properly. The connection is checked for corrosion before the circuit is put back into service.
Never leave a protective cover open on live terminals until the next visit. It is there to keep moisture off the connection, and an open cover is what is causing the trips.
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Tell us what’s going on. Symptoms, setup, photos, anything we should know. We’ll assess and come back with the right next step.