Cuts Off - Midea V8 VRF Series Service Manual

V8 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
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
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Possible cause
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Troubleshooting
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.
82
Digital display
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.
E21/E24/E81 (1)
Is the
temperature sensor plug
connecting to the IDU main
control board 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