E06
Alpha Inlet Temperature Sensor Fault

Display shows E06 and the unit will not operate; may occur intermittently with fluctuating water 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

Open or shorted inlet NTC sensor, Corroded sensor connector, Damaged sensor wiring harness, Defective control board input

How to Fix / Troubleshooting

Safety: Turn OFF power before accessing electrical components.

  • Locate inlet sensor: Find the Alpha inlet (cold) temperature sensor on the cold water inlet pipe or manifold.
  • Inspect connections: Unplug the sensor connector and check for corrosion, moisture, or loose pins. Dry and reseat the connector firmly.
  • Check resistance: With power OFF, measure the sensor resistance with a multimeter and compare to the Alpha temperature/resistance chart. An open circuit or zero ohms indicates a failed sensor.
  • Inspect harness: Follow the wiring back to the main control board, looking for cuts, pinches, or burn marks.

If the sensor tests bad, replace it with an OEM Alpha inlet temperature sensor. If the sensor is good but E06 persists, the main control board may be faulty and should be diagnosed by a technician.

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Repair Difficulty

Medium 3/5

Required Part

Inlet Temperature Sensor (NTC)
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