E18
Sta-Rite
Mode/Selector Switch Fault
Heater shows E18; may not recognize calls for heat from spa or pool mode
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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
Failed pool/spa mode switch, Corroded keypad contacts, Faulty user interface board
How to Fix / Troubleshooting
Safety: Turn off power before removing the front control panel or keypad.
- Check keypad operation: Press the pool/spa and temperature buttons and observe if the display responds correctly. Unresponsive buttons indicate keypad or UI failure.
- Inspect mode switch wiring: On models with a physical selector switch, verify that the harness is intact and firmly connected to the control board.
- Clean contacts: If accessible, gently clean switch contacts with electronic contact cleaner. Do not soak the keypad.
- Replace UI or switch: If E18 persists and buttons do not function reliably, replace the Sta-Rite user interface board/keypad assembly or the pool/spa selector switch.
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Repair Difficulty
Medium
3/5
Required Part
User Interface Board
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