Toshiba MMK-AP0072H Service Manual page 81

Check code name
[H07] / [d7]
(Current code / AI-NET)
Are balance pipe valves
of all outdoor units in same line
fully opened?
YES
Are TK1, TK2, TK3, and
TK4 sensors of the error-detected
unit correctly connected?
Is there no sensor detached
or misinstallation?
YES
Are characteristics of TK1 to TK4
of error-detected unit normal?
YES
Check gas leak of all outdoor units
in the same line and check soaked oil.
No error
Check refrigerant stagnation
in compressor.
Refrigerant stagnation
Correct refrigerant stagnation
in compressor,
reset power supply,
and start the operation.
Check oil level judgment of each unit.
Are all oil levels correct?
YES
Clear cause of stagnation.
Indoor/outdoor PMV error
(Cause of refrigerant stagnation),
discharge check valve error, etc.
(Reference) When refrigerant stagnates in compressor shell, the oil level shortage may be judged.
Check code name
Oil level down
detection protection
NO
NO
NO
* Characteristics-4
YES
NO
(*1) Check leakage of valves
(SV3A, SV3C) and clogging (SV3B, SV3E).
(*2) Check clogging of oil return circuit
from oil separator. (Capillary tube, strainer)
Check clogging of SV3D valve.
Check clogging of solenoid valves (SV3A, SV3C)
of all outdoor units in the same line. (*3)
7-segment display with
SW01/02/03=1/15/1
NO
Check clogging of oil equalization circuit.
1. Valves of balance pipes closed.
2. Miscabling or misinstallation of TK1 to TK4
sensors
3. TK1 to TK4 sensor error
4. Gas leak or oil leak of all outdoor units
5. Refrigerant stagnation of compressor case
6. SV3A, 3B, 3D, 3C, 3E valve error
7. Clogging of oil return circuit from oil separator
8. Clogging of oil-equation circuit system
No leakage or clogging
No choke
No choke
(*4)
81
FILE NO. SVM-05052
Cause of operation
Open balance pipe valves fully,
reset power supply,
and start operation.
Correct miswiring and misinstallation.
TK1: CN514
( )
TK2: CN515
TK3: CN516
TK4: CN523
Sensor error Replace
Specify gas leak position and repair it.
(Recharging, refill oil)
YES
Replace faulty part.
YES
Replace faulty part.
YES
Replace faulty part.
Choke
Replace faulty part.