Gree TERRA09HP230V1A Installation, Service & Troubleshooting page 76

Troubleshooting 18,000/24,000 btuh Units, cont.
Malfunction
#
Name
Indoor
Display
34 Malfunction of U3
voltage drop-
ping for DC
bus-bar
35 Voltage of DC PL
bus-bar is too
low
36 Limit/decrease EU
frequency due
to high tempera-
ture of module
37 The four-way U7
valve is abnor-
mal
38 Zero-crossing U9
malfunction of
outdoor unit
39 Limit/decrease FH
frequency due
to freezing
76
Indoor Unit Display
Display Method
Method
(repeated every 5
o = Off
Heating
n = Illuminated
Indicator
« = Blink
Off 3s and
o
blink 20 times
Off 3s and
o
blink 21 times
n
n
n
n
Outdoor Unit
seconds)
During cooling and drying
n n n
operation, compressor will
stop while indoor fan will
operate. During heating
operation, the complete unit
will stop operation.
During cooling and drying
n n o
operation, compressor will
stop while indoor fan will
operate. During heating
operation, the complete unit
will stop operation.
All loads operate normally,
n n «
while operation frequency
for compressor is decreased.
If this malfunction occurs
o « o
during heating operation,
the complete unit will stop
operation.
During cooling and drying
n « o
operation, compressor will
stop while indoor fan will
operate. During heating
operation, the complete unit
will stop operation.
All loads operate normally,
n n o
while operation frequency
for compressor is decreased.
A/C Status
Supply voltage is unstable
1. Measure the voltage of
position L and N on wiring
board (XT), if the voltage is
higher than 150VAC, turn
on the unit after the supply
voltage is increase to the
normal range; 2. If the AC
input is normal, measure
the voltage of electrolytic
capacitor C on control
panel (AP1), if its normal,
theres malfunction for the
circuit, please replace the
control panel (AP1)
Discharging after the
complete unit is de-ener-
gized for 20 mins check on
whether the thermal grease
on IPM Module of out-
door control panel AP1 is
sufficient and whether the
radiator is inserted tightly.
If its no use, please replace
control panel AP1.
1. Supply voltage is lower
than AC175V; 2. Wiring
terminal 4V is loosened or
broken; 3. 4V is damaged,
please replace 4V
Replace outdoor control
panel AP1
Poor air-return in indoor
unit or fan speed is too low
Possible Causes