The first question a technician asks is what happened, and the honest answer is usually a paraphrase of something noticed in passing several days ago. That gap is where diagnostic time gets spent, and diagnostic time is the part of a service call you pay for whether or not it finds anything.
Who this helps
An owner whose generator has done something unexpected, and who is about to call someone about it.
When to read it
Read this before you make the call. Most of what a technician needs is easiest to capture while the event is fresh, and impossible to reconstruct afterwards.
What you can decide afterwards
What to record and have ready before a technician is called, and whether this is a service call or something that needs a faster response.
Quick answer
Write down what happened in the order it happened, copy any message on the controller exactly as it appears rather than describing it, photograph the unit’s data plate, and find whatever service records exist. Then decide whether this is a service call or an emergency: a gas smell, smoke, sparks, or a burning odour is not a service call, and the utility or emergency services come before the generator company. Do not open the enclosure, and do not keep restarting a unit that has shut itself down.
What this chapter can help you determine
Whether this needs an emergency response or a scheduled visit, and what to have in front of you when you make the call.
What to capture while the event is still fresh.
What a technician will ask for, and where to find it.
How to tell a service call from something that needs a faster response.
What not to do while waiting.
Three things to settle before you dial
Is this a service call, or something faster?
Some conditions are not generator problems in the first instance. They are gas, fire, or electrical emergencies that happen to involve a generator, and they are routed elsewhere.
This points here when:
There is a smell of gas anywhere near the property.
There is smoke, a burning smell, or visible sparking.
Any part of the installation is standing in water.
A carbon-monoxide alarm has sounded.
If this is the wrong call: Waiting on a service appointment for a condition that needed the gas utility, the fire service, or an evacuation. If any of the above applies, leave the area and call the utility or emergency services from somewhere else first.
What exactly happened, in order?
A sequence is diagnostic; an impression is not. What the unit did, when, and what the household observed around it are the raw material a technician works from.
This points here when:
The unit did something unexpected, whether or not it has repeated.
A message appeared on the controller.
The behaviour changed after weather, a power event, or recent work at the property.
Someone in the household noticed something before the fault was obvious.
If this is the wrong call: The technician diagnoses from a paraphrase, investigates the wrong system first, and the visit ends with a plan to come back.
What documents exist, and where are they?
The unit’s identity and its service history determine what a technician can look up before arriving and what parts they think to bring.
This points here when:
The unit was installed by someone other than the company being called.
The property was bought with the generator already in place.
There have been previous visits, whether or not you have the paperwork.
Nobody has looked at the documentation since installation.
If this is the wrong call: A first visit spent establishing what the equipment is, rather than what is wrong with it.
What you probably already know
Roughly when the behaviour started.
Whether the household has had the unit serviced.
Who installed it, or who last worked on it.
Whether anything unusual happened at the property recently.
What is commonly still unknown at this point
The exact wording of any message the controller displayed.
The unit’s model and serial number.
Whether previous visits are documented anywhere.
Whether the unit is still within any warranty period.
Whether the behaviour is a fault at all, or normal operation nobody had noticed before.
Information to gather
A written sequence of what happened and when, in the order it happened.
Any controller message copied exactly as displayed, including punctuation, rather than summarised.
A photograph of the data plate showing make, model, and serial number.
Photographs of the unit and its surroundings, taken from a safe distance.
Whatever service records exist, and the name of whoever last worked on it.
The installation paperwork, if the property has it.
Questions worth asking when you call
Based on what I have described, is this something to schedule or something to treat urgently?
What should the household do, or avoid doing, before you arrive?
What information or access will you need on the day?
Do you work on this make and model, and can you obtain parts for it?
What does the visit cover, and what happens if the fault is not found on the first visit?
Should the unit be left switched off until you arrive?
What an inspection can confirm
Whether what the household observed is a fault or normal behaviour.
Which system the fault sits in.
Whether the controller message reflects the underlying cause or a downstream effect.
Whether the unit is safe to leave in service until a repair happens.
What requires a qualified professional
Do not open the enclosure or any panel. A standby generator can start automatically, and involves utility-voltage electricity and fuel gas.
Do not keep restarting a unit that has shut itself down. A protective shutdown is the equipment protecting itself, and repeated restarts can turn a contained fault into a larger one.
Do not clear or reset a controller message before it has been recorded. The message is often the most useful thing the technician has.
If gas is smelled, leave and call the gas utility or emergency services from elsewhere. Do not investigate the source.
Nothing here identifies what is wrong. Diagnosis requires someone qualified with hands on the equipment.
What this chapter cannot tell you
What is wrong with your generator.
Whether the unit is safe to run before someone has looked at it.
Whether the fault is minor or serious.
What the visit will cost.
Deliberately out of scope here:
Any diagnosis. This page does not identify what is wrong and cannot.
Any repair procedure, or anything requiring the equipment to be opened.
What a service visit costs.
Whether a technician will find the fault on the first visit.
Common questions
Should I turn the generator off while I wait for service?
Ask when you call, because the answer depends on what the unit is doing and what your manual says for that condition. If the unit has shut itself down, leave it shut down rather than restarting it repeatedly.
The controller is showing a message. Should I clear it?
Record it first, exactly as displayed. The message is frequently the most useful single piece of information a technician has, and clearing it before writing it down discards it. Whether it should then be cleared is a question for the technician.
Can I describe the problem over the phone and get an answer?
A phone description can help a technician decide urgency and what to bring, but it cannot produce a diagnosis. Anyone offering a firm cause without examining the equipment is guessing, and a guess that sounds confident is still a guess.
I do not have any service records. Does that matter?
It makes the first visit longer, and it is worth saying so when you call rather than letting the technician discover it. Where the property was bought with the generator in place, the installer named on any permit paperwork is sometimes traceable.
Bottom line
Capture the sequence, copy the message exactly, photograph the data plate, and find the records. Then rule out the conditions that are emergencies rather than service calls. Those four things cost a few minutes and change what the first visit is able to achieve; reconstructing them a week later is guesswork, and the technician will be working from your guess.
Repair or replace your standby generator — Whether this generator warrants a repair conversation or a replacement conversation when you next speak to a qualified technician.
the symptom library — If the behaviour matches a documented fault, that page cites what the manufacturer says about it before you make the call.
whether this repair is covered — Coverage is far easier to establish before work is authorised than after an invoice, so it is worth settling while you are still gathering the model and serial number.