V6R VRF 50Hz
146
Midea
V
6R
Series S
er
vice M
anual
2.32
U21, U22, U23: Ambient temperature is out range of test operation.
Digital display output
Description
Ambient temperature is out range of test operation.
All units stop running.
Error code is only displayed on the master unit.
Trigger / recover condition
Trigger condition:
After entering the test operation, the master outdoor unit judges whether it is suitable for the trial operation based on
the average value of the detected T1 and the outdoor ambient temperature T4. If it is not in the unsuitable zone, make
the cooling self-test and heating self-check selection according to the following table.
If it is out range of test operation, the outdoor unit displays the fault code "U21 or U22 or U23".
Item
Conditions
Code
Not suitable for outdoor
temperature
Minimum outdoor temperature ≤ -24.5
o
C or Minimum outdoor
temperature ≥ 48
o
C
U21
Not suitable for indoor
temperature
Indoor average temperature ≥ 35
℃
U22
Not suitable for outdoor
temperature and indoor
temperature
1. Indoor average temperature
＜
0
o
C
，
Minimum outdoor
temperature ≥ 5
o
C
2. Indoor average temperature ≥0
o
C and Minimum outdoor
temperature - Indoor average temperature ≥ 30
o
C
U23
Recover condition:
Press the OK key for 5 seconds to exit the test operation.
Reset method: Manually restart.
