Toyotomi GAN-A180GVR Service Manual page 40

Display Method of Indoor Unit
Malfunction
Name
Indicator Display (during blinking,
ON 0.5s and OFF 0.5s)
Dual-8
No.
Code
Display
Operation
Malfunction of
33 module P7
temperature
sensor circuit
Module high
34 temperature P8
protection
Malfunction of
voltage
35 U3
dropping for
DC bus-bar
Voltage of DC
36 PL
bus-bar is too
low
Limit/decrease
frequency due to
37 high EU
temperature of
module
The four-way
valve is
38 U7
abnormal
Zero- crossing
39 malfunction of U9
outdoor unit
Limit/decrease
40 frequency due to FH
antifreezing
Display
Outdoor Unit
Indicator has 3 kinds of
display status and they
will
circularly every 5s.
OFF
COOL Heating
D40 D41 D42 D43
Indicator Indicator Indicator
OFF 3S
and blink
18 times
OFF 3S
and blink
19 times
OFF 3S
and blink
20 times
OFF 3S
and blink
21 times
Method of
be displayed
A/C status
ON Blink
During cooling
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
During cooling
compressor will stop while indoor
fan will operate; During heating
operation, the complete unit will
stop
During cooling
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
During cooling
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
All loads operate normally, while
operation frequency
compressor is decreased
If this malfunction occurs during
heating operation, the complete
unit will stop operation.
During cooling
compressor will stop while indoor
fan will operate; during heating,
the complete unit
operation.
All loads operate normally, while
operation frequency
compressor is decreased
Possible Reasons
and drying
Replace outdoor control panel AP1
operation, After the complete unit is de-energized for 20mins,
check whether the thermal grease on IPM Module
of outdoor control panel AP1 is sufficient and
whether the radiator is inserted tightly. If it's no use,
please replace control panel AP1.
and drying
Supply voltage is unstable
1. Measure the voltage of position L and N on wiring
board (XT), if the voltage is higher than 150VAC,
and drying
turn on the unit after the supply voltage is increased
to the normal range.
2.If the AC input is normal, measure the voltage of
electrolytic capacitor C on control panel (AP1), if it's
normal, there's malfunction for the circuit, please
replace the control panel (AP1)
Discharging after the complete unit is de-energized
for 20mins, check whether the thermal grease on
for IPM Module of outdoor control panel AP1 is
sufficient and whether the radiator is inserted tightly.
If it's 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.
operation,
Replace outdoor control panel AP1
will stop
for Poor air-return in indoor unit or fan speed is too low