Midea V8 VRF Series Service Manual page 87

V8 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
Error display
The faulty IDU stops. Other IDUs of the same system: operate normally.
Error impact
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

Troubleshooting
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.
86
Digital display
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?
No
Is the
temperature sensor
resistance
abnormal (2)?
No
Replace the main control
board of the IDU
Display position
Panel, display box, and wired controller
Yes
Reconnect the plug tightly
Yes
Replace the temperature
sensor