U21, U22, U23: Ambient Temperature Is Out Range Of Test Operation - Midea VRF Series Service Manual

V6R VRF 50/60Hz

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
Not suitable for outdoor
temperature
Not suitable for indoor
temperature
Not suitable for outdoor
temperature and indoor
temperature
 Recover condition:
Press the OK key for 5 seconds to exit the test operation.
 Reset method: Manually restart.
146
Conditions
Minimum outdoor temperature ≤ -24.5
o
temperature ≥ 48 C
Indoor average temperature ≥ 35℃
1. Indoor average temperature ＜ 0
o
temperature ≥ 5 C
2. Indoor average temperature ≥0
temperature - Indoor average temperature ≥ 30
o
C or Minimum outdoor
C ， Minimum outdoor
o
o
C and Minimum outdoor
o
C
Code
U21
U22
U23