Heatrae Sadia
No Flow Detection / Start-Up Failure
Heatrae Sadia electric water heater does not start when a hot tap is opened (no display change, no heating).
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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
Stuck flow switch, Blocked inlet filter, Faulty microswitch on flow assembly, No water supply to heater
How to Fix / Troubleshooting
Safety first: Isolate power and close the water supply before opening the heater.
Steps to restore operation:
- 1. Confirm water supply: Check that cold water is available at other outlets and that the isolation valve to the heater is open.
- 2. Clean inlet filter: Remove and clean the inlet strainer to restore flow.
- 3. Inspect flow switch: Open the heater and locate the flow switch assembly. Check that the paddle or piston moves freely. Clean out debris and scale.
- 4. Test microswitch: With power off, operate the flow mechanism by hand and listen/feel for the microswitch click. Replace the microswitch or entire flow assembly if it does not operate reliably.
- 5. Reassemble and test: Restore water and power, then open a hot tap to confirm the heater starts.
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Repair Difficulty
Medium
3/5
Required Part
Flow Switch Assembly / Microswitch
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