Absolute Generator Repair, Service & Installation in Gauteng
Same-day service On-site repair Call 072 686 0472
Generator cranking but not starting, running with no power, or due for a service? We repair and service petrol, inverter and diesel standby generators of all makes, and install generators with changeover switches, at your home or business anywhere in Gauteng.
Updated
🔍 R850 generator call-out & assessment⚡ Same-day call-outs · 90% of major spares carriedQuick answer
We repair, service and install generators across Gauteng: small petrol and inverter units like Honda, and diesel standby gensets for homes and businesses. The most common faults we fix are generators that crank but won't start, won't crank at all, run but give no power, or surge and hunt under load. Services cover oil, filters, spark plugs or injectors, battery, coolant and a run under load. We also install generators with a changeover switch so they connect safely to your board. Same-day call-outs, an R850 call-out and assessment in all areas, and a fixed price before any work. Call or WhatsApp 072 686 0472.
Generators we work on
- Petrol generators, from small portable units to larger open-frame and electric-start models.
- Inverter generators, the quieter units with clean power for TVs, computers and electronics.
- Diesel standby generators in canopies, for homes, shops, offices and small businesses, including units with automatic controllers and changeover panels.
We work on all makes, including Honda and the other petrol, inverter and diesel brands sold in South Africa.
Common generator faults we fix
- Cranks but won't start. Usually fuel: an empty or contaminated tank, blocked filters, air in the diesel lines, a stuck fuel solenoid or a blocked carburettor on petrol units. A weak battery that drops too low while cranking can also stop it firing.
- Won't crank at all. A flat or failed battery, a loose or corroded battery terminal, the starter motor, or the controller not sending the start signal.
- Runs, but no power at the plugs or the board. A tripped breaker on the generator, a failed AVR (automatic voltage regulator), worn brushes or an alternator fault.
- Surging, hunting or unstable voltage. Fuel supply, governor or carburettor problems on petrol units, or a faulty AVR.
- Shuts down on its own. Low oil, overheating, or a faulty oil pressure or temperature sensor triggering the safety shutdown.
Real generator jobs
Kempton Park: 38 kVA diesel generator cranking but not starting
This 38 kVA diesel standby generator in Kempton Park would crank over but never start, so the property had no backup power. We opened up the canopy and worked through the starting system and fuel supply to find the fault, fixed it, and ran the generator to check it started and took over properly. The photo shows the generator open on site, with its controller and changeover panel.
Kempton Park: Honda generator maintenance and check-up
A general service and check-up on a Honda generator in Kempton Park. Our technician checked the battery and starting, took the voltage regulator out to inspect it, and went through the engine and electrical side so the generator would be ready to run when the power goes off.
Generator servicing
A generator usually sits unused for weeks, then has to start first time when the power goes. A regular service is what makes that happen. Depending on the generator, a service covers:
- Engine oil and oil filter changed
- Air filter and fuel filters cleaned or replaced
- Spark plug (petrol) or fuel system checks (diesel)
- Battery tested, terminals cleaned and charging checked
- Coolant level and hoses on water-cooled diesels
- Belts, mountings and the exhaust checked
- A test run with a load connected, checking voltage and frequency
Follow the service hours in your generator's manual, and have it serviced at least once a year even if it hasn't done many hours. Old fuel and flat batteries are the most common reasons a generator lets you down.
Generator and changeover switch installation
We install generators for homes and businesses, connected to your distribution board through a changeover switch, manual or automatic. The changeover switch is what keeps the generator and the municipal supply apart, so the generator can never feed back into the grid, which is dangerous for anyone working on the lines. We help you choose the right size in kVA for what you need to run, and position the generator with proper ventilation and the exhaust away from windows and doors.
Power cuts and surge damage
If an appliance stopped working after a power cut, a surge or a generator changeover, we can test it, and write a power surge damage report for your insurer if you need one.
Where we work
We are based in Kempton Park and repair and service generators across Gauteng: Johannesburg, Sandton, Midrand, Pretoria and Centurion, the East Rand including Edenvale, Bedfordview, Benoni and Boksburg, and the West Rand.
Frequently asked questions
How much is a generator call-out?
A generator call-out and assessment is R850, the same in all areas of Gauteng. Our technician comes to you, tests the generator and finds the fault, and you get a fixed price for the repair, service or installation before any work starts.
Why does my generator crank but not start?
Usually it is fuel: an empty or contaminated tank, blocked filters, air in the diesel lines, a stuck fuel solenoid, or a blocked carburettor on a petrol unit. A weak battery that drops too low while cranking is the other common cause. We test the fuel supply and starting system on site to find which it is.
Why is my generator running but not giving power?
Check the breaker on the generator first. If that is fine, the usual causes are a failed AVR (automatic voltage regulator), worn brushes or an alternator fault. We test the output and replace the faulty part.
How often should a generator be serviced?
Follow the service hours in the manual, and service it at least once a year even if it has hardly run. Generators often fail when they are needed most because of old fuel, a flat battery or dirty filters, which a service picks up.
Do you repair diesel standby generators and inverter generators?
Yes. We repair and service petrol, inverter and diesel standby generators of all makes, for homes and businesses across Gauteng.
Can you install a generator and changeover switch?
Yes. We install generators connected through a manual or automatic changeover switch, so the generator and the municipal supply are kept apart and it can never feed back into the grid.
Need it fixed?
Send us the brand, model and what it's doing on WhatsApp. Monday to Saturday, 07:30–17:30.
Related pages
Book a service call
Tell us what's broken and where you are. We'll call you back to confirm a time, usually the same day.
- Genuine OEM parts fitted wherever they're available, and we tell you upfront if we use a quality equivalent
- Technicians with over 10 years of experience and 10,000+ completed jobs
- 6-month guarantee on every repair and installation
- Generator call-out and assessment: R850, the same in all areas of Gauteng
- Fixed price agreed before any repair work starts
- Same-day call-outs, and we carry around 90% of major spares
- Prefer to talk? Call 072 686 0472 or WhatsApp us