AGS
Hayward
Automatic Gas Shutoff Fault
Heater shows AGS and locks out; no heating occurs.
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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
Tripped AGS sensor due to overheating, Faulty AGS sensor, Poor water flow, Blocked heat exchanger
How to Fix / Troubleshooting
Safety First: Turn off power and gas. Do not operate the heater until the cause of AGS trip is identified.
- Check water circulation: Ensure the pump is running properly and the filter is clean.
- Inspect AGS sensor: Locate the AGS sensor on the header or heat exchanger. Check for loose wiring or signs of overheating.
- Reset (if applicable): Some AGS devices are manual reset; press the reset button only after the heater has cooled.
- Professional evaluation: Repeated AGS trips indicate overheating or combustion issues. Have a technician inspect for scale, blocked passages, or incorrect gas input.
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Repair Difficulty
Professional Required
5/5
Required Part
Automatic Gas Shutoff Sensor
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