MCAC-VTSM-2016-04
R410A DC Inverter VRF V4 Plus W Series 50Hz
Troubleshooting 203
3.3 E2: Communication error between indoors and the master unit
E2: Communication error between
indoors and the master unit
Communication wires P, Q, E are
short circuit or disconnected (Measure
the resistance among P Q and E, the
normal resistance is
120Ω)
Reconnect the communication
wires
Communication wires are not
connected in line shape
The communication wires are interfered
by high voltage power (voltage over
220V is high voltage power)
Communication wires are close to
electromagnetic interference source.
Such as transformer, strong fluorescent
lamp, etc.
Remove the interference source, or
use device to filter out the interference
The length of communication wire is
over 1200m.
Adjust the wire length to less than
1200m(3937ft) or strengthen the
signal
Yes
Yes
Yes
Connect the communication wires
in line shape
No
No
No
No
No
Yes
Ensure the communication wires and
high voltage wires do not twining
Yes
Outdoor main PCB
is damaged
Replace the outdoor
main PCB