E18
American Water Heaters
Setpoint / Memory Error in Control
Electronic gas water heater displays E18; unit may not respond to thermostat changes or may over/under-heat.
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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
Corrupted control memory, Power surge damage, Internal control failure
How to Fix / Troubleshooting
Safety: Disconnect power before resetting or replacing controls.
- 1. Factory reset: Follow the service manual procedure to perform a factory reset of the control settings. This may involve holding specific buttons for a set time.
- 2. Power cycle: Remove power for several minutes, then restore and reprogram the desired temperature.
- 3. Surge protection: If the heater is on a circuit prone to surges, consider installing a surge protector.
- 4. Replace control: If E18 returns after reset and power cycling, the gas control valve/control board assembly is likely defective and should be replaced by a technician.
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Repair Difficulty
Hard
4/5
Required Part
Gas Control Valve / Electronic Control Assembly
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