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ComAp controllers show this as a text alarm on the display, not as a numbered code.
The DC control battery voltage has dropped below the minimum operating threshold. Low battery voltage can prevent reliable engine starting and may cause controller malfunction.
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For 24V systems, batteries should maintain 25-28V float charge. For 12V systems, 13-14V. During cranking, voltage should not drop below 18V (24V system) or 9V (12V system).
Lead-acid starting batteries typically last 3-5 years. Perform annual load testing and replace when capacity drops below 80% of rated. AGM batteries may last longer.
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.
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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.
8 diagnostic steps · intermediate · technician
8 diagnostic steps · intermediate · technician