Aircon Diagnostics

Choose the right diagnostic tool first. Each tool helps you narrow likely fault patterns before committing to repair scope.

Choose your tool

Use symptom-based, code-based, or blink-pattern guidance depending on what you can observe right now.

Start with the clearest signal you already have.

No code shown, just behavior change

Use Symptom Checker first.

Controller shows a fault code (e.g. U4, CH21, E6)

Use Error Code Lookup.

Light is blinking but no explicit code

Use Blinking Light Lookup.

Move from tool output into deeper explainers and real diagnosis scenarios.

Major vs targeted repair

Compressor vs capacitor failure

Major replacement was advised first, but targeted testing found a smaller failure.

Recurring cooling loss

Refrigerant leak, not just low gas

Repeated top-ups were masking one leak path that needed proper repair.

Post-service failure

Not cold after servicing

Cooling failed soon after service because one service step was incomplete.

Not sure which tool fits your situation?

Send us what you see right now and we'll tell you the next best diagnostic step.