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F8 – OUTDOOR UNIT CONTROL PANEL AND MODULE PANEL COMMUNICATION ERROR
Cause of Error
Tools Required
Possible Broken Part
Troubleshooting
Procedures
Cause: Only the models with the module panels separated
with the outdoor unit control panels may have this error. When
the machine is running normally, the module panel and the
outdoor unit control panel would coordinate with each other
on the communication to work and when the communication
is off, the outdoor unit control panel would raise the 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 → outdoor unit control panel
Multimeter and regular module panel
Module panel and main control data line, module panel and
main external control panel.
1.
First check if the communication connection line
(mostly 4 chips) between the module panel and main
control panel gets loose and if the connection is faulted.
Measure and check with a multimeter if the power from
2.
the main external control panel is normal and especially
note that if the 5V (3.3V) power is led to the module
panel. Eliminate the possibility that it's not running
normally because there is no 5V (3.3V) power at the
module panel.
The maintenance personnel should replace the module
3.
panel of the faulted air conditioner with a regular
module panel taken with him and if the communication
error disappears when the external machine is switched
on, it means the original module panel is faulted and if
the error is still there, maybe the outdoor unit control
panel should be replaced.
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