Heatrae Sadia Short Cycling / Unstable Temperature Control

Heatrae Sadia instantaneous water heater cycles rapidly on and off during use, causing temperature swings.

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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

Oversized heater for low flow, Faulty flow sensor, Incorrect minimum flow setting, Blocked shower head or aerator

How to Fix / Troubleshooting

Safety first: Isolate power before opening the unit. Avoid scalding by testing water temperature carefully.

Steps to stabilise operation:

  • 1. Clean outlets: Remove and clean shower heads and tap aerators to ensure adequate flow.
  • 2. Check minimum flow: Some models have an adjustable minimum flow setting. Ensure it is set according to the installation manual.
  • 3. Inspect flow sensor: Clean or replace the flow sensor/turbine if it is sticking or giving erratic readings.
  • 4. Verify supply pressure: Ensure cold water pressure is within the specified range for the heater. Very low pressure can cause cycling.
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Repair Difficulty

Medium 3/5

Required Part

Flow Sensor / Turbine
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