Toshiba MM-A0160HX, Service Manual

Page: 86 / 135

Troubleshooting
Diagnostic Procedure for Check Code
87
14
Check connector
Pd sensor: CN516
Ps sensor: CN515
[
]
Check code Operation cause
1. Balancing pipe valve (all outdoor units in the
connecting line) closed
[d7] 2. Compressor case oil removal valve closed
Protection of low oil level detection 3. Miswiring of TK1 sensor/TK2 sensor
4. Refrigerant stagnation in compressor case
5. SVA3, SV3B, SV3C valves error
6. Blockage in oil return circuit of oil separator
7. Blockage in oil tank circuit
Are balancing pipe valves
of all outdoor units
fully open ?
Is the compressor case oil
removal valve fully open
?
Replace defective part.
Replace oil tank circuit.
Open compressor case oil
removal valve fully,reset
power supply, and start the
operation.
No
Yes
No
Yes
Are TK1 and TK2 sensors
correctly connected ?
Open balancing pipe valve fully,
reset power supply, and start
the operation.
No
Yes
(*1) Is there a 2-way valve
leakage (SV3A, SV3C) or
blockage (SV3B) ?
Yes
No Leakage/Blockage
Replace defective part.
(*2) Is there a blockage in the
oil return circuit of oil separator
(Capillary, strainer) ?
Yes
No blockage
Replace defective part.
Is there blockage in 2-way
valve of all outdoor units in the
connecting line (SV3A, SV3C) ?
Yes
No blockage
Is there refrigerant stagnation
in compressor case ?
No
Yes
Refrigerant
stagnation is
detected.
Check refrigerant stagnation
in compressor case, reset the
power source, and then start
the operation.