Charger LEDs indicate error; unit reports ‘temperature sensor fault’ or similar (if diagnostic available)

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

Disconnected temperature sensor harness, Damaged thermistor on heatsink or PCB, Shorted sensor wires, Failed ADC input on control board

Safety: De‑energize the unit before opening.

Locate sensor: Find the temperature sensor (often a small thermistor attached to the contactor or heatsink) and trace its wires to the control board.
Check connection: Ensure the sensor plug is fully seated on the board and wires are intact.
Inspect sensor body: Look for cracks or physical damage to the thermistor.
Resolution: Replace the temperature sensor harness if damaged. If the sensor is good but E20 persists, the control board input may be faulty and the board should be replaced.

Medium 3/5

Internal Temperature Sensor Harness

Check Price on Amazon

We may earn a commission from links on this page.