E9
Richmond
EEPROM / Internal Control Memory Error
Tankless heater shows E9 and will not operate; may occur after a power surge or lightning storm.
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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 board firmware, Power surge damage, Failed main control board, Loose board connectors
How to Fix / Troubleshooting
Safety first: Turn OFF power at the breaker before touching any wiring or boards.
- Hard reset: Turn OFF the breaker supplying the Richmond heater for at least 5 minutes. Turn it back ON and attempt to restart the unit. Sometimes this clears transient memory errors.
- Inspect control board: Remove the front cover and visually inspect the main PCB for burn marks, cracked components, or a burnt smell. Check that all multi-pin connectors are fully seated.
- Surge protection: If the error appeared after a storm, consider installing a whole-house or dedicated surge protector to prevent future damage.
- Board replacement: If E9 persists after a reset and there is no visible wiring issue, the main control board is likely defective. Replacement should be performed by a qualified technician to ensure correct configuration and safe operation.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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