Atlantic heat-pump water heater displays E8 and the compressor does not start.

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.

Possible Causes

Failed condenser NTC sensor, loose sensor clip, damaged harness, faulty control board input

Safety: Isolate electrical power. Do not disturb refrigerant piping.

Open the heat pump module cover to access the condenser temperature sensor mounted on the hot coil or water heat exchanger.
Verify that the sensor is properly clamped to the pipe or plate and that thermal paste (if used) is intact.
Measure resistance and compare to the Atlantic NTC chart. Replace the sensor if out of tolerance.
Check the harness for continuity and reseat the connector on the control board.
If E8 persists with a known-good sensor, replace the heat pump control board.

Hard 4/5

Condenser NTC Sensor

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