R410A DC Inverter Series Carrier service manual
168 Troubleshooting
4.3 E4: Ambient temperature sensor (T4) error/ (Display on faulty unit, all the ODU in standby)
Connecting wire between
sensor and main control board
is loose
Fasten the connecting port
Sensor is short circuit or disabled
(Using a multimeter to measure
resistance, if the resistance is too
small, the sensor is short circuit, if
the resistance in certain temperature
is not consistent with attached table
1, the sensor is disabled)
Replace the sensor
Outdoor main control board is
damaged
No
No
Yes
Yes
Replace the outdoor main control board
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