Indoor unit shows E23; unit may not start compressor

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 outdoor ambient NTC sensor, Sensor not located in free air, Damaged sensor cable, Faulty outdoor PCB sensor input

Safety: Isolate power before opening the outdoor unit.

Steps:

1. Locate ambient sensor: It is usually mounted on the outdoor unit frame or grille, away from the coil, exposed to outdoor air.
2. Check mounting: Ensure it is not touching hot surfaces or enclosed where it cannot sense true ambient temperature.
3. Inspect wiring: Look for damage or corrosion at the connector. Reseat the plug on the outdoor PCB.
4. Test and replace: Measure resistance; if open/shorted, replace with a Baxi ambient NTC sensor.

Medium 3/5

Outdoor Ambient Temperature Sensor (NTC)

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