GREE Air-ccoled Closed Control Unit Service Manual
88
Ⅲ Maintenance
1. Malfunction List
Malfunction Signal Source Control logic
Power Error
Phase reversal
protector
When phase sequence has malfunction for continuous
3 seconds, the complete unit will stop and all loads will
be turned off (without restriction of set delay time). The
corresponding error code will be displayed on display
and alarm will be given out. Reset or de-energize the
unit to clear the error code.
Alarm of
overheating
of return air
Probe of temp and
humidity of return
air
In auto mode, when indoor fan of each module has
operated for over 15 min.(3 seconds for quick test), and
return air temperature is higher than the upper limit for
continuous 30 seconds, the corresponding malfunction
code will be displayed on display and also the alarm will
be given out. The unit will keep running. Reset the unit
or detect that such signal has disappeared for 3 minutes
(3 seconds for quick test), the malfunction code will be
removed. If the unit stops for other malfunction during
this course, the unit makes a judgment again.
Alarm of low
temperature
of return air
Probe of temp and
humidity of return
air
In auto mode, when indoor fan of each module has
operated for over 15 min.(3 seconds for quick test), and
return air temperature is higher than the lower limit for
continuous 30 seconds, the unit will treat the
malfunction as same as the malfunction of overheating
of return air. (If a module has malfunction of probe of
return air, the detection of the overheating of return air
will be shielded).
Alarm of
high
humidity of
return air
Probe of temp and
humidity of return
air
In auto mode, when indoor fan of each module has
operated for over 15 min. (3 seconds for quick test), and
return air humidity is higher than the upper limit for
continuous 30 seconds, the unit will treat the
malfunction as same as the malfunction of overheating
of return air. (If a module has malfunction of probe of
return air, the detection of the overheating of return air
will be shielded).
Alarm of low
humidity of
return air
Probe of temp and
humidity of return
air
In auto mode, when indoor fan of each module has
operated for over 15 min.(3 seconds for quick test), and
return air humidity is higher than the lower limit for
continuous 30 seconds, the unit will treat the
malfunction as same as the malfunction of overheating
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