GREE Air-ccoled Closed Control Unit Service Manual
92
malfunction will be displayed, and alarm will be given
out. Manually turn off and de-energize the unit to clear
the malfunction signal.
Main module
communicati
on
malfunction
Mainbaord
If there is communication malfunction between
sub-module and main module for 30s, the indoor fan will
operate once the unit is started up while it will be turned
off once the unit is turned off. Compressor, electric
heater and humidifier will be turned off according to
manual turning off sequence. Corresponding
malfunction will be displayed, and alarm will be given
out. If mainboard resume communication to touchable
screen automatically, the unit will resume operation and
malfunction signal will be removed. Manually turn off
and de-energize the unit to clear the malfunction signal.
Communicat
ion
malfunction
of remote
monitoring
Main board
If there is communication malfunction between main
module and remote monitoring module, “remote
monitoring” will disappear on homepage of screen and
corresponding malfunction will be displayed on
malfunction area of remote monitoring interface, along
with “Buzz”. The unit will keep operation. When
communication is resumed, the malfunction will be
automatically removed.
Customer
linkage
protection
Main board
If linkage signal is detected for continuous 30s (3s for
quick test), the complete unit will be turned off without
being restricted by set delay time. Manually turn off and
de-energize the unit to clear the malfunction signal.
Fire alarm
Main board
If signal of fire alarm is detected for continuous 3s, the
complete unit will stop without being restricted by set
delay time. Corresponding malfunction will be displayed,
and alarm will be given out. Reset or de-energize the
unit to clear the malfunction signal.
Adhesion
alarm of
electric
heating
AC contactor of
electric heater
When electric heater is turned off and adhesion of AC
contactor is detected for continuous 10s, if indoor fan is
turned off, it will be turned on while if it operates, it will
keep operating. Other load will normally work.
Corresponding malfunction will be displayed, and alarm
will be given out. It can’t be automatically resume
normal operation and pressing reset button will not
work. De-energize the unit to clear the malfunction
signal.
Discharge
temp sensor/
inlet pipe of
evaporator
Temp sensor
If the temp sensor is short of open circuit for continuous
30s, compressor and corresponding loads will be turned
off without being restricted by set delay time. Outdoor
fan will be turned off in 5 seconds. Corresponding
