E2: Indoor Units And Master Unit Communication Error - Midea VRF V4 Plus I Series Manual

R410A DC Inverter V4 Plus 50Hz
5.3 E2: Indoor units and master unit communication error (Only display on master unit, all the ODU
in standby)
E2: Indoor units and master
unit communication error
Signal wires P, Q, E are short circuit or
disconnected (Measure the resistance
among P, Q and E, the normal
resistance is 120Ω)
No
Signal wires are not connected in
series
No
The signal wires are interfered by high
voltage power (voltage over 220V is
high voltage power)
No
Signal wires
electromagnetic interference source.
Such as transfer, strong fluorescent
lamp, etc.
No
The length of communication wire is
over 1200m
No
MC9S08AC128 chip is disabled
No
Main board is disabled
96
are close to
Reconnect the signal wires
Yes
Connect the signal wires in line
Yes
shape
Yes
Ensure the signal wires and high
voltage wires do not twining
Remove the interference source, or
Yes
use device to filter out the interference
Adjust the wire length to less than
Yes
1200m or strengthen the signal
Yes
Replace main board
MCAC-VTSM-2014-04
Troubleshooting