DELUXE
Inverter
Service
M
anual
（
16
）
F8-main external control panel and module panel communication error
（
exclusive of
external machine of single panel
）
Explanation of
error
Cause:
Only the models with the module panels separated with the main
external control panels may have this error. When the machine is
running normally,
the module panel and the main external control
panel
co
mmunicate and co
ordinate with each other
yet
when the
communication is off, the main external control panel
can
raise
an
alarm of
"main control panel and module panel communication error". Only
"module panel, data line and main external control panel" are related
to
such communication.
Inspection path:
data line connection → module panel power →module panel
→main external control panel
Tools required
for inspection
Multimeter and regular module panel.
Frequent
problematic part
Module panel and main control data line, module panel and main external
control panel.
Inspection
procedure and
key points
1. First check if the communication connection line (mostly 4 chips) between
the module panel and main contr
o
l panel
i
s loose and if the connection is
fault
y
.
2. Measure and check with a multimeter if the power from the main external
control panel is normal and especially
check
that the 5V (3.3V) power is led to
the module panel. El
i
minate the possibility that it's not running normally
because there is no 5V (3.3V) power at the module panel.
3. The maintenance personnel shall replace the module panel of the fault
y
air
conditioner with a
another
regular
module panel
. I
f the
communication error
disappears when the external machine is switched on, it
means the original
module panel is fault
y
and if the error is still there, the main external control
panel sh
ould
be replaced.
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