Fault Diagnosis & Repairs

Proper diagnosis before repair

Air conditioners throw fault codes for a reason, and that reason is not always the part the code points to. We have seen plenty of units with a perfectly good compressor replaced because someone read a fault code literally instead of actually testing the system. Before we replace anything, we run proper diagnostics: refrigerant pressures, electrical readings, sensor values and airflow, so the repair actually fixes the problem instead of masking it for a few months.

Common fault codes we see

Code	Common meaning
E6	Communication error between indoor and outdoor unit
E7	Indoor and outdoor unit mismatch or wiring fault
L1	Compressor overcurrent or overload protection triggered
EC42	Outdoor unit fault, often linked to sensor or board issues

Fault codes vary between manufacturers, so the same code can mean something different on a Daikin versus a Mitsubishi. We reference the specific brand and model before making a call on what is actually wrong.

Common symptoms we get called out for

• System running but not cooling or heating properly
• Unit switching off shortly after starting
• Water leaking from the indoor unit
• Unusual noises from the outdoor unit
• System not responding to the remote at all
• Ice building up on the outdoor unit outside of defrost cycles

Why accurate diagnosis matters

Replacing a part that was not actually faulty costs you money and does not fix the original problem, which usually resurfaces within weeks. A refrigerant leak that gets topped up without finding the leak point will just need topping up again. Proper diagnosis takes a bit longer up front, but it means the repair we carry out actually solves the issue, rather than delaying the same callout.