Midea V8 VRF Series

V8 VRF Indoor Units
82
Midea
V8
Series VRF Indoor Units
6.1.35 E21, E24, E81 - T0 (fresh inlet air temperature sensor) short-circuits or cuts off, T1 (IDU return air
temperature sensor) short-circuits or cuts off, and TA (outlet air temperature sensor) short-circuits or
cuts off
Error display
Digital display
Display position
Panel, display box, and wired controller
Error impact
The faulty IDU stops. Other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
Error trigger
When detecting that the temperature sensor short-circuits or cuts off
Error recovery
Automatic recovery
Possible cause
 The temperature sensor is damaged.
 The sensor plug to the T0/T1/TA port in the IDU main control board is loose.
 The IDU main control board is damaged.
Troubleshooting
E21/E24/E81 (1)
Is the
temperature sensor plug
connecting to the IDU main
control board loose?
Reconnect the plug tightly
Replace the main control
board of the IDU
No
Yes
Yes
No
Is the
temperature sensor resistance
abnormal (2)?
Replace the temperature
sensor
Note:
1) The E21/E24/E81 code respectively corresponds to the T0/T1/TA temperature sensor. Check
the wiring nameplate to find the sensor port on the main control board.
2) Measure the resistance between two pins of the sensor plug with a multimeter. A resistance
value close to 0 indicates a short circuit has occurred in the temperature sensor, and a resistance
value close to infinity indicates an open circuit in the temperature sensor.