All Power America
Transfer Switch Not Engaging
Generator runs but there is no power at the house; lights and appliances remain off even though the generator sounds normal.
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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
Faulty automatic transfer switch (ATS) contactor, Mechanical binding in ATS, Control wiring failure between generator and ATS, Incorrect wiring of load and utility terminals
How to Fix / Troubleshooting
Safety first: Lock out both utility and generator sources at the transfer switch. Only qualified persons should open the ATS enclosure.
- Verify generator output: Measure voltage at the generator output lugs with a meter. If correct, the issue is likely in the ATS or downstream wiring.
- Inspect ATS contactor: Open the All Power America-compatible ATS and visually inspect the contactor for burned contacts or mechanical damage. Manually operate the contactor (if design allows) to ensure it moves freely.
- Check control signal: Confirm that the generator is sending a transfer signal to the ATS and that the ATS coil is receiving the correct voltage when the generator is running.
- Repair or replace ATS: Replace the ATS contactor or entire switch assembly if it fails to engage under proper control signal.
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Repair Difficulty
Professional Required
5/5
Required Part
Automatic Transfer Switch Contactor
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