Midea
V8
Series VRF Indoor Units
6.1.38 F01, F11, F21 - T2A (heat exchanger inlet temperature sensor) short-circuits or cuts off, T2 (heat
exchanger middle temperature sensor) short-circuits or cuts off, and T2B (heat exchanger outlet
temperature sensor) short-circuits or cuts off
Panel, display box, and wired controller
The faulty IDU stops. Other IDUs of the same system: operate normally.
ODU of the same system: operate normally.
When detecting that the temperature sensor short-circuits or cuts off
The temperature sensor is damaged.
The sensor plug connecting to the T2A/T2/T2B port in the IDU main control board is loose.
The IDU main control board is damaged.
F01/F11/F21 (1)
Is the
temperature sensor
plug connecting to the IDU
main control board
getting 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 F01/F11/F21 codes respectively correspond to T2A/T2/T2B temperature sensors. 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.
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