E18
Heatrae Sadia
Supply Voltage / Power Limitation Error
Heatrae Sadia digital water heater shows E18 and limits power output.
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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
Low mains voltage, Incorrect wiring size causing voltage drop, Internal power supply fault, Configuration set to reduced power mode
How to Fix / Troubleshooting
Safety first: Electrical measurements should only be carried out by a competent person. Isolate power before opening the unit.
Steps to address E18:
- 1. Check supply rating: Confirm that the heater is connected to the correct voltage and breaker size as per the rating plate.
- 2. Measure voltage: Have an electrician measure the voltage at the heater terminals under load. Low voltage may require electrical supply investigation.
- 3. Inspect wiring: Ensure cable size and run length are appropriate to minimise voltage drop. Upgrade wiring if undersized.
- 4. Configuration check: Some models allow selection of maximum power. Verify settings in the installer menu and adjust if appropriate.
- 5. Internal PSU: If external supply is correct but E18 persists, the internal power supply or sensing circuit on the PCB may be faulty and require replacement.
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Repair Difficulty
Hard
4/5
Required Part
Control PCB / Internal Power Supply
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