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DSE controllers show this as a text alarm on the display, not as a numbered code.
The generator output voltage has exceeded the maximum safe limit. Over voltage can damage connected equipment and indicates a problem with the Automatic Voltage Regulator (AVR), generator excitation, or voltage sensing circuits.
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Over voltage is usually caused by AVR malfunction, incorrect AVR adjustment, or sudden load rejection. The AVR should regulate output to 220V/380V +/-5%.
A standard 3-phase generator should produce 380V line-to-line (220V line-to-neutral) at 50Hz. Acceptable tolerance is typically +/-5% (361V to 399V).
Send us the code or alarm and what the generator is doing, and one of our engineers will help you diagnose it.
Search other controller alarms and engine fault codes, with troubleshooting steps, in Generator Oracle.
Launch Generator Oracle →Full diagnostic guide
A fault code names a symptom, not a cause. Our engineers have written the diagnostic sequence they use on site for this class of fault — ranked causes, ordered steps with the reading expected at each one, and the point at which to stop and call someone.
10 diagnostic steps · advanced · qualified electrician
10 diagnostic steps · advanced · qualified electrician
8 diagnostic steps · advanced · qualified electrician