E18
Elnur
Phase Configuration / Phase Loss Fault
Boiler displays E18; may indicate incorrect phase configuration on multi-phase Elnur boilers.
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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
Missing phase on three-phase supply, Incorrect wiring of phases to boiler terminals, Blown external fuse on one phase, Loose phase connection
How to Fix / Troubleshooting
Safety first: Three-phase supplies are extremely dangerous. Only qualified electricians should work on phase wiring.
- Verify supply: Using appropriate test equipment, confirm that all required phases are present at the boiler isolator and that voltages are within specification.
- Check terminal connections: Inspect the boiler's supply terminal block for tightness and correct phase sequence as per the Elnur wiring diagram.
- Inspect external fuses/breakers: Check that all phase fuses or breakers are intact and have not tripped.
- Correct wiring errors: Any miswired phases must be corrected according to the installation manual. Label phases clearly to avoid future mistakes.
- Reset and test: After correcting the supply, reset the boiler and confirm that E18 clears.
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Repair Difficulty
Professional Required
5/5
Required Part
Supply Terminal Block
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