Toyotomi KURO Mini Service Manual page 6

Display method of indoor unit
Indicator display
Error
Power Cool Heat
code
indicator indicator indicator
Flash 5
times
Flash 4
times
Flash 7
times
Flash 6
times
Flash
14
times
Flash
11
times
Flash
15
times
Flash
16
times
Flash
18
times
Malfunction
AC status
name
Outdoor air Complete unit stops operation;
discharge motor of sliding door is cut off
temperature power.
is open/short-
circuited
Malfunction of Cool/Dry: compressor stops
micro switch operation, while indoor fan
operates;
Heat: all loads stops operation.
System is Cool/Dry: all loads stops
abnormal operation except indoor fan;
Heat: all loads stops operation.
Desynchronizing of
Cool/Dry: compressor stops
compressor
operation, while indoor fan
operates; Heat: all loads stops
operation.
PFC protection Cool/Dry: compressor stops
operation, while indoor fan
operates; Heat: all loads stops
operation.
Demagnetization
Cool: compressor and outdoor fan
protection of
stop operation; Heat: compressor
compressor
and outdoor fan stop operation at
first; about 1min later, indoor fan
stops operation.
Communication
Normal operation
malfunction
between indoor
unit and inspection
board
Malfunction of Compressor, outdoor fan and
humidity sensor indoor fan stop operation;
High power Cool: compressor and outdoor
protection fan stops operation, while indoor
fan operates.
Start-up failed Cool/Dry: compressor stops,
while indoor fan operates; Heat:
all loads stops operation.
Lost phase Cool: compressor and outdoor fan
stop operation; Heat: compressor
and outdoor fan stop operation at
first; about 1min later, indoor fan
stops operation.
Undefined Cool: compressor and outdoor
outdoor unit fan stops operation, while indoor
error fan operates; Heat: compressor,
outdoor fan and indoor fan stop
operation.
Over-phase Cool/Dry: compressor stops
current operation, while indoor fan
protection of operates; Heat: all loads stops
compressor operation.
Communication Cool: compressor and outdoor
malfunction fan stops operation; Heat:
between the compressor and outdoor fan stop
drive board and at first; about 1min later, indoor
the main board fan stops operation;
Circuit Cool/Dry: compressor stops
malfunction operation, while indoor fan
of module operates; Heat: all loads stops
temperature operation.
sensor
Possible causes
1. The exhaust temperature sensor is not connected well or
damaged. (refer to Page 69 "Table 3")
2.Temperature sensor wire of outdoor unit is damaged; short
circuit between the temperature sensor and copper pipe or
outer case
3.Main board of outdoor unit is damaged;
1. The sliding door is blocked;
2. Malfunction of the photoelectric inspection panel of sliding
door;
See Page 53 "High temperature prevention protection; high
power; system isabnormal"
See "Page 55 "Desynchronization diagnosis for compressor"
1. The power grid quality is bad; AC input voltage fluctuates
sharply;
2. Power plug of air conditioner or wiring board or reactor is not
connected reliably;
3. Indoor and outdoor heat exchanger is too dirty, or air inlet/
outlet is blocked;
4. Main board of outdoor unit is damaged.
1. The main board of outdoor unit is damaged;
2. Compressor is damaged;
1. Poor connection between the indoor unit and the inspection
board.
2.The main board of indoor unit is damaged;
3. The inspection board is damaged;
The inspection board is damaged.
See Page 53 "High temperature prevention protection; high
power; system isabnormal"
See Page 56 "Malfunction diagnosis for failure startup"
1. The main board of outdoor unit is damaged;
2. The compressor is damaged;
3. The connection wire of compressor is not connected well.
1. Outdoor ambient temperature exceeds the operation range
o
of unit (eg: less than-20 C or more than 60
o
than 30 C for heating);
2. Are wires of compressor not connected tightly?
3. Failure startup of compressor?
4. Is compressor damaged?
5. Is main board damaged?
See "Page 49 "Overload protection of compressor , High
discharge temperature protection of compressor"
1. The drive board is damaged;
2. The main board of outdoor unit is damaged;
3. The drive board and the main board is not connected well.
Replace outdoor control board
o
C for cooling; more
39