E17
Heatrae Sadia Outlet Temperature Too High / Anti-Scald Protection

Heatrae Sadia digital water heater shows E17 and water temperature is limited or unit shuts down.

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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

Thermostatic mixing valve mis-set or failed, Blocked outlet sensor, Flow rate too low, Scale on heat exchanger

How to Fix / Troubleshooting

Safety first: Risk of scalding. Allow hot water to cool before working on the system. Isolate power before removing covers.

Steps to address E17:

  • 1. Check outlet temperature: Using a thermometer, measure hot water temperature at a tap. If above recommended levels (typically 50–55°C at outlets), reduce the setpoint or adjust the mixing valve.
  • 2. Inspect thermostatic mixing valve (TMV): If fitted on the outlet of the heater or cylinder, ensure it is correctly set and not blocked. Clean or replace strainers and check for scale.
  • 3. Check flow rate: Ensure adequate flow through the heater. Clean aerators and shower heads. Low flow can cause high outlet temperatures.
  • 4. Descale heat exchanger: In hard water areas, descale the heat exchanger following Heatrae Sadia guidelines or replace if heavily scaled.
  • 5. Sensor check: Verify the outlet NTC sensor is correctly positioned and functioning (see E06). Replace if faulty.
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Repair Difficulty

Medium 3/5

Required Part

Thermostatic Mixing Valve / Outlet NTC Sensor
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