Information to gather
Provide the manufacturer and model, number of indoor and outdoor units, approximate installation date, error code, symptoms, when the fault began and any recent electrical or building work. Photographs of the unit label and installation can help the engineer prepare.
Safe first checks
You can check the controller setting, replace remote batteries, confirm accessible isolators have not been switched off and clean user-serviceable filters in line with the manual. Do not remove covers, work on electrics or open the refrigerant circuit.
Refrigerant and electrical work
Fault finding involving refrigerant or fixed electrical systems requires an appropriately qualified professional. Ask the attending business to explain the diagnosis and quote before authorising repair.
Repair or replace?
The decision depends on the system’s age, refrigerant type, parts availability, efficiency, repair cost and whether the current design still suits the building. A responsible recommendation should compare both options.