F24
Siemens
Utility Supply Frequency Out of Range
Controller shows F24 Utility Frequency Fault; generator may not transfer to or from utility.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Actual utility frequency instability, Incorrect controller frequency settings, Faulty frequency sensing in ATS or controller, Loose sensing wiring
How to Fix / Troubleshooting
Safety first: Utility-side work must follow local codes and may require a licensed electrician. Open the main breaker before accessing terminals.
- Measure utility frequency: Use a meter with frequency function at the ATS utility terminals. Confirm it matches the nominal frequency (50 or 60 Hz).
- Inspect sensing connections: Tighten all utility sensing terminals and check for corrosion or loose wires between ATS and controller.
- Verify settings: In the Siemens controller, ensure the utility frequency and acceptable deviation limits are correctly configured.
- Utility provider check: If frequency is truly unstable, contact the utility provider. The generator is responding correctly to an out-of-spec supply.
- Replace sensing module if needed: If measured frequency is stable but F24 persists, the frequency sensing circuit in the controller or ATS may be defective.
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Repair Difficulty
Hard
4/5
Required Part
ATS Utility Frequency Sensing Circuit
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