E11
A.O. Smith
Gas Valve / Gas Control Fault
A.O. Smith tankless or condensing heater shows E11 and shuts down
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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
Defective gas valve coil, Loose gas valve wiring, Incorrect gas pressure, Control board not driving gas valve correctly
How to Fix / Troubleshooting
Safety: Turn off gas at the manual shutoff and disconnect power. Do not attempt to disassemble the gas valve body.
- 1. Verify gas supply: Confirm other gas appliances operate normally. If not, contact your gas supplier.
- 2. Inspect wiring: Locate the gas valve on the manifold. Check that all electrical connectors are fully seated and free of corrosion or burn marks.
- 3. Reset unit: Restore power and attempt a reset per the manual. Observe if the unit attempts ignition before E11 appears.
- 4. Professional testing: A technician should measure gas inlet and manifold pressures and test the gas valve coil resistance. If the valve does not open when commanded, it must be replaced.
Because gas valve replacement affects combustion safety, this repair should be performed by a licensed gas technician.
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Repair Difficulty
Professional Required
5/5
Required Part
Gas Valve Assembly
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