Electrical compressor tests
Winding, insulation, current and supply checks.
Compressor and refrigeration diagnosis
Aircon Compressor Fault Diagnosis & Replacement
A compressor is a major component, so it should not be replaced until the electrical supply, controls, fan operation, coils, refrigerant circuit and protection devices have been checked. Some “compressor faults” are caused by another system problem.
Service scope
Practical repairs for residential, commercial and industrial systems
A compressor is a major component, so it should not be replaced until the electrical supply, controls, fan operation, coils, refrigerant circuit and protection devices have been checked. Some “compressor faults” are caused by another system problem.
Control verification
Contactors, inverter boards, relays, sensors and safeties.
Heat-rejection checks
Condenser coil and fan condition.
Refrigeration diagnosis
Pressure, restriction, contamination and refrigerant condition.
Replacement planning
Correct part, oil, filter-drier, vacuum and charging.
Repair vs replacement
Assessment of age, condition, parts and total cost.
Faults investigated
Problems our technicians diagnose
- Outdoor unit hums but compressor does not start
- Breaker or overload trips when cooling starts
- Compressor runs but pressure difference is poor
- Inverter system displays compressor or drive faults
- Compressor overheats or cycles on protection
- System has severe contamination after a burnout
Diagnosis before replacement
How the service is handled
The technician verifies whether the compressor receives the correct power and command, then checks winding condition, current draw, fan operation, coil condition and refrigeration behaviour. Replacement is quoted only after the likely root cause is understood.
- Clear fault assessment
- Written quotation before major work
- Testing after repair or service
- Maintenance recommendations where relevant
Information to send when booking
Share the location, equipment brand, model if visible, system type, fault symptoms, when the problem started and photographs of the indoor and outdoor equipment.
Send Details on WhatsAppIndicative 2026 pricing
Service price guide
These ranges show typical starting points. The final quotation depends on system size, access, parts, refrigerant and the fault found.
| Service | Indicative price | Typical inclusion |
|---|---|---|
| Compressor diagnostic | R1,250–R3,500 | Electrical and refrigeration checks |
| Split compressor replacement labour | R3,500–R7,500 | Compressor, gas and materials excluded |
| Commercial compressor replacement | Site-specific quote | Access, lifting and circuit size dependent |
| System flush / drier work | Site-specific quote | Required after some failures |
| Repair-vs-replace assessment | Included in diagnosis | Written quotation and recommendation |
Pricing note: Prices are 2026 estimates for standard access and are confirmed in writing after inspection. Spare parts, refrigerant quantity, cranes or access equipment, electrical upgrades, travel outside core service areas and VAT may be additional unless specifically included in the quotation.
View the complete aircon and HVAC price list →Customer questions
Frequently asked questions
Can an aircon compressor be repaired?
Some faults are external electrical or control problems. A mechanically or electrically failed sealed compressor is normally replaced rather than rebuilt on site.
How do I know the compressor is faulty?
Professional testing is required. Similar symptoms can be caused by capacitors, contactors, inverter boards, fans, sensors, low voltage or refrigerant problems.
Is compressor replacement worth it?
It depends on unit age, condition, parts cost, refrigerant type, installation quality and the price of replacement equipment.
What is included in compressor replacement?
A proper scope may include recovery, component replacement, filter-drier work, pressure testing, vacuum, correct charging, electrical testing and commissioning.
Do commercial compressor replacements require lifting equipment?
Sometimes. Rooftop, chiller and large VRF compressors may need cranes, lifting plans or special access, which are quoted separately.
Book an air-conditioning inspection
Send the equipment type, brand, location and fault description for a faster response.