E6
CTC
Flow Sensor / Turbine Fault
Display shows E6 and unit cycles on and off rapidly or fails to maintain set temperature
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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 or scaled flow turbine, Failed Hall-effect flow sensor, Blocked inlet filter screen, Damaged flow sensor wiring harness
How to Fix / Troubleshooting
Safety first: Turn off power and close the cold water supply valve. Relieve pressure by opening a hot water tap.
Steps to check:
- Locate the flow sensor assembly on the cold water inlet of the CTC water heater. It typically contains a small turbine and sensor.
- Remove the inlet filter screen and clean any debris or scale. Rinse thoroughly and reinstall.
- Remove the flow sensor body according to the service manual. Inspect the turbine for free rotation; remove scale or debris carefully.
- Check the electrical connector from the flow sensor to the main control PCB. Reseat the connector and inspect for corrosion.
- If the turbine is damaged or the sensor does not output pulses (requires a meter or oscilloscope), replace the flow sensor assembly.
Tip: After reassembly, slowly open the inlet valve and purge air from the system before restoring power.
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Repair Difficulty
Medium
3/5
Required Part
Flow Sensor Assembly
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