Hitachi Indoor Heat Exchanger Sensor Fault (Cassette/Ducted)

Cassette/ducted unit shows C2, abnormal coil temperature behavior

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

Open/shorted coil thermistor, Disconnected sensor from PCB, Sensor not properly attached to coil, Damaged sensor cable

Safety first: Turn OFF power and ensure safe access to the ceiling unit.

Steps:

Locate sensor: Find the thermistor attached to the indoor coil.
Check attachment and wiring: Ensure it is firmly attached and the cable/connector are intact.
Replace if faulty: If wiring is damaged or resistance is out of spec (technician measurement), replace with correct Hitachi sensor.

Hard 4/5

Indoor Coil Thermistor (Cassette/Ducted)

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