A.O. Smith Water Heater Error Code 1 Flash: How to Fix It
Easy 5-10 minutes Low Severity
Verified June 2026
- Error Code
- 1 Flash
- Brand
- A.O. Smith
- Product Type
- water_heater
- Severity
- Low
- DIY Difficulty
- Easy
- Estimated Fix Time
- 5-10 minutes
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Tools You'll Need
- None required
How to Fix Error Code 1 Flash
-
Verify Normal Operation Status
-
Check Hot Water Supply
-
Monitor Temperature Settings
Water temperatures above 125°F can cause scalding. Adjust settings carefully. -
Document Normal Operation
-
Schedule Regular Maintenance
Parts You May Need
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No parts needed
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No parts needed
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No parts needed
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No parts needed
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No parts needed
Check Price on Amazon
No parts needed
Check Price on Amazon
No parts needed
Check Price on Amazon
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When to Call a Professional
Call a professional if you have hot water issues despite the 1 flash normal status code, if you notice gas odors, water leaks, or if you're uncomfortable performing any maintenance tasks on gas appliances.Frequently Asked Questions
What does 1 flash mean on A.O. Smith water heater?
1 flash on an A.O. Smith water heater indicates normal operation. The pilot light is lit, the system is functioning properly, and no error conditions are present.
Should I be worried about the 1 flash code?
No, the 1 flash code is good news. It means your water heater is operating normally. This is the status you want to see during regular operation.
Why is my A.O. Smith water heater flashing once but no hot water?
If you see 1 flash but no hot water, check the temperature setting, ensure gas supply is adequate, and verify the thermostat is functioning. The pilot may be lit but other components could have issues.
How often should I check the status light on my water heater?
Check the status light monthly during routine visual inspections. The 1 flash pattern should remain consistent during normal operation.
What comes after 1 flash if problems develop?
If problems occur, the status light will change to different flash patterns indicating specific error codes. Multiple flashes or different patterns signal various system faults requiring attention.