Heatrae Sadia Temperature Sensing / Mixing Discrepancy

Heatrae Sadia digital water heater shows correct temperature but actual outlet water is much cooler.

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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

Sensor not in correct position, Crossflow between hot and cold pipes, Faulty thermostatic mixing valve, Incorrect plumbing connections

How to Fix / Troubleshooting

Safety first: Isolate power before adjusting sensors. Be cautious of sudden temperature changes at outlets.

Steps to correct discrepancy:

  • 1. Check sensor placement: Ensure outlet sensor is properly attached to the hot outlet and insulated from ambient air.
  • 2. Inspect TMV and mixers: Check thermostatic mixing valves and mixer taps for internal faults that may be blending in excessive cold water.
  • 3. Check for cross-connections: Verify that there are no incorrect links between hot and cold circuits (e.g. via a faulty single-lever mixer) causing backfeeding.
  • 4. Compare at heater outlet: Measure temperature directly at the heater outlet (if accessible) to confirm heater performance.
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Repair Difficulty

Medium 3/5

Required Part

Outlet Temperature Sensor / Thermostatic Mixing Valve
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