Midea MV6-R252WV2RN1 - 3.2.5 Procedure

V6R VRF 50Hz
151
Part
6
-
Diagnosis and Troubleshooting
Procedure
E2
Communication wires P Q have short
circuited or disconnected
1
Yes
Reconnect the communication wires
No
Wires between outdoor and MS
communication terminals block are loose
Yes
Ensure the wires are connected properly
No
The sequence of the PQE signal lines is
incorrect.
Yes
Reverse the sequence of signal lines.
No
Interference from high voltage (220V or
higher) wires
Yes
Ensure the communication wires and
high voltage wires are separated
No
Communication wires are close to a
source of electromagnetic radiation such
as transformer or strong fluorescent lamp
Yes
Remove the source of interference, or
add additional shielding to the
communication wires
No
The length of communication wire is over
1200m
Yes
Reduce the wire length to less than
1200m
No
Replace the outdoor main PCB or
communication terminals block resolves
the error
No
Replace the MS PCB or communication
terminals block
Notes:
1. Measure the resistance among P, Q and E. The normal resistance between P and Q is 120Ω, between P and E is infinite, between Q and E is infinite.