E7
Atlantic
Evaporator Coil Temperature Sensor Fault
Atlantic hybrid or heat-pump water heater shows E7 and stops heating with the heat pump.
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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
Defective evaporator NTC sensor, broken sensor wiring, sensor dislodged from evaporator, control board sensor input failure
How to Fix / Troubleshooting
Safety: Disconnect power. Do not open the sealed refrigeration circuit.
- Access the heat pump module on top or side of the Atlantic unit (depending on model).
- Locate the evaporator temperature sensor clipped to the evaporator coil fins.
- Check that the sensor is firmly attached to the coil and that its cable is not damaged or pinched.
- Measure the sensor resistance at ambient temperature and compare with Atlantic specifications. Replace the sensor if readings are out of range.
- Inspect and reseat the sensor connector on the control board.
- If the sensor and wiring are good but E7 remains, the control board's sensor channel may be defective and the board should be replaced.
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Repair Difficulty
Hard
4/5
Required Part
Evaporator NTC Sensor
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