Toyotomi KURO Mini Service Manual page 107

43 Communication failure with Unit A
43 Communication failure with Unit A
44 Communication failure with Unit B
44 Communication failure with Unit B
Service Manual
45 Communication failure with Unit C
45 Communication failure with Unit C
46 Communication failure with Unit D
46 Communication failure with Unit D
Gas pipe temperature sensor malfunction of A
47 Unit A freeze protection
47 Unit A freeze protection
48 Unit B freeze protection
Liquid pipe temperature sensor malfunction of B 48 Unit B freeze protection
49 Unit C freeze protection
49 Unit C freeze protection
Gas pipe temperature sensor malfunction of B
50 Unit D freeze protection
50 Unit D freeze protection
overheating prevention protection
51 Unit A
overheating prevention protection
Liquid pipe temperature sensor malfunction of C 51 Unit A
overheating prevention protection
52 Unit B
overheating prevention protection
52 Unit B
Gas pipe temperature sensor malfunction of C
overheating prevention protection
53 Unit C
overheating prevention protection
53 Unit C
overheating prevention protection
54 Unit D
overheating prevention protection
Liquid pipe temperature sensor malfunction of D
54 Unit D
55 Unit A communication wire misconnection or expansion valve malfunction
55 Unit A communication wire misconnection or expansion valve malfunction
Gas pipe temperature sensor malfunction of D
56 Unit B communication wire misconnection or expansion valve malfunction
56 Unit B communication wire misconnection or expansion valve malfunction
57 Unit C communication wire misconnection or expansion valve malfunction
Liquid pipe temperature sensor malfunction of E
57 Unit C communication wire misconnection or expansion valve malfunction
58 Unit D communication wire misconnection or expansion valve malfunction
58 Unit D communication wire misconnection or expansion valve malfunction
Gas pipe temperature sensor malfunction of E
Exit of the condenser tube sensor malfunction
Correspondence is normal
Note: discharge the position in below pictures with discharge resistance after open the top cover and
Note: discharge the position in below pictures with discharge resistance after open the top cover and
check if the voltage is below 20V with universal meter, then begin to check.
check if the voltage is below 20V with universal meter, then begin to check.
Communication failure between indoor unit and
14/18K:
14/18K:
outdoor unit
Indoor ambient sensor malfunction
Indoor evaporate sensor malfunction
Mode conflict
Accept fluorine mode
Jumper cap malfunction protection
Anti-freezing protection
9.2 Malfunction Checking and Elimination
1 IPM protection malfunction:
1 IPM protection malfunction:
Main checking point:
Main checking point:
If the input voltage of the unit is within normal range?
If the input voltage of the unit is within normal range?
If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct?
If the connection wire of compressor is connected well? Is it loose? If the connection sequence is correct?
If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good?
If the resistance of compressor coil is normal? If the isolation of compressor coil with copper pipe is good?
If the unit is overloaded? If the heat radiation of the unit is good?
If the unit is overloaded? If the heat radiation of the unit is good?
If the refrigerant charge is suitable?
If the refrigerant charge is suitable?
Flow chart:
Flow chart:
Installation and Maintenance
Flash 18 times
Flash 19 times
Flash 20 times
Flash 21 times
Flash 22 times
Flash 23 times
Flash 24 times
Flash 25 times
Flash 26 times
Flash 27 times
24/28K:
24/28K:
Flash 7
times(n=indoor
unit number)
Often bright
(indoor unit all
Communication
failure)
F1
F2
E7
Fo
C5
FH
29