Generator repair: a guide for pros

What customers ask, how to win the job, and what to put on your profile.

Offering generator repair

Generator repair rewards the technician who tests the whole path, from fuel to load to transfer, and not just the engine. Customers call in the middle of an outage, so a fast, clear diagnosis earns trust and repeat service.

What customers ask

  • Why won't it start, and is it the fuel or the engine?
  • Why didn't the generator power the house during the outage?
  • How long will the repair take, and can you get the part?
  • Is it worth fixing an older unit?
  • Can you check it under load before I rely on it again?

How to win the job

  • On the first call, ask when the fault started, what it did, and whether it ran under load. Those answers set the order of tests.
  • Bring fuel test strips, a spark tester, a load bank or a meter, and a set of common filters and plugs for the major makes.
  • Show the customer the fuel and the spark readings before you replace anything, and explain each reading in plain terms.
  • Quote the diagnosis and the parts separately, and tell the customer which part you expect to need before the visit.
  • Run the unit under load before you hand it back, and record the voltage and frequency on the service record.
  • Give the customer a written service sheet with the parts replaced, the readings and the next service date.

What to put on your profile

  • Photos of generator repairs showing the failed part and its replacement
  • The generator makes and standby or portable types you service, listed by name
  • A short note on how you test the transfer switch and the load

Follow-up that helps the customer

  • Offer a scheduled service visit for the battery, the oil and the transfer test before the storm season
  • Suggest fuel stabilizer and storage guidance for units that sit for long periods, with the product explained
  • Offer a review of the transfer switch if the unit fails its self-test more than once

Licenses and permits

Generator repair is commonly done by licensed technicians and, when it involves the house wiring or transfer switch, under an electrical contractor license. Fuel line work may require its own license. Check with your state or local licensing agency for the rules that apply to each part of the repair.

Questions

Should I tell the customer when a repair costs more than the unit is worth?

Yes. Show the cost of the repair next to the cost of a comparable unit, and explain the age and parts availability. The customer can then decide without pressure.

What if the transfer switch is the problem?

Test the switch with the unit under load and show the customer the result. If the switch is failing, replace it and test the full sequence before you leave.

About this guide

This national guide is written and checked by infinibell. Rules and conditions differ by place, so local pros are credited on guides for the cities they serve, not on national ones.

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