E07
Alpha
Outlet Temperature Sensor Fault
Unit displays E07 and shuts down; may occur during long draws of hot water.
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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 outlet NTC sensor, Loose sensor clamp on pipe, Damaged sensor wiring, Faulty control board
How to Fix / Troubleshooting
Safety: Turn OFF power and allow pipes to cool before touching.
- Locate outlet sensor: Identify the Alpha outlet temperature sensor on the hot water outlet pipe or heat exchanger outlet.
- Check mounting: Ensure the sensor is firmly clamped to the pipe or inserted fully into its well, with thermal paste if specified by Alpha.
- Inspect wiring: Look for frayed insulation, loose connectors, or signs of overheating. Reseat the connector on the control board.
- Test sensor: Measure resistance and compare to the Alpha chart. Replace the sensor if readings are out of range.
If replacing the sensor does not resolve E07, the control board’s sensor input circuit may be defective and require professional replacement.
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Repair Difficulty
Medium
3/5
Required Part
Outlet Temperature Sensor (NTC)
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