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    Generator Servicing: Why a Neglected Generator Fails When You Need It Most

    A generator that sits unused between outages often won't start when load-shedding hits. The servicing and maintenance that keeps your Johannesburg generator reliable.

    10 March 2026 5 min read
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    Here's the cruel irony of generators: the one that sits quietly in the corner waiting for load-shedding is exactly the one that won't start when load-shedding finally hits. A little maintenance prevents that.

    Why idle generators fail

    Between outages, fuel degrades and gums up, the electric-start battery goes flat, filters clog and parts seize. A generator only thought about during outages is the one that lets you down during one.

    The fix: service and run it

    Service a standby generator at least annually, and run it briefly every month or two to keep it ready. That alone prevents most no-start failures.

    What a service covers

    • Oil and filter change
    • Fuel system check (and draining stale fuel)
    • Spark plug and air filter inspection
    • Starter battery test
    • A run-up under load to confirm it performs
    • For standby units, checking the automatic transfer switch

    Fuel storage matters

    For long idle periods, a fuel stabiliser or draining old fuel prevents the gumming that stops a generator starting. Or consider a silent, maintenance-light inverter for everyday load-shedding and keep the generator for long outages (see standby vs portable). Ask us about a maintenance routine.

    Frequently Asked Questions

    Service a standby generator at least annually and run it briefly every month or two to keep it ready. A generator that sits unused between outages commonly won't start when you need it — stale fuel, a flat starter battery and seized parts are the usual culprits. Regular running and servicing prevents that.

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