Generator Fault Finding
Generator Won't Start
Why a generator may crank but fail to start.
Diagnosis matters
What may be causing the fault?
A generator that won't start can have a starting, fuel, control, sensor or safety-shutdown fault. Proper testing helps isolate the cause before parts are replaced.
Generator systems combine engine, fuel, electrical generation, control and protection systems. A symptom alone does not identify the failed component. Testing the relevant circuits and operating conditions is the safer way to determine the repair.
What a technician may check
- Battery and starting system
- Fuel supply and fuel-system components
- Engine protection and shutdown signals
- Control panel and fault indications
- Alternator and AVR circuits
- Output voltage and frequency
- Cooling and mechanical condition where relevant
Need help?
Describe the generator fault
Tell us what happens when you try to start or run the generator and where the generator is located.