Compressor 1 Case Thermo Operation; Compressor 2 Case Thermo Operation - Toshiba Super MMU-AP0091H Service Manual

Check code name
[H04] / [44]
(d07 / AI-NET)
[H14] / [44]
(d07 / AI-NET)
Is case thermo circuit normal?
1. Connector connection
2. Cabling
3. I/F P.C. board
(Note 1)
YES
Are service valves of
gas pipe and liquid pipe of
outdoor unit fully opened?
YES
Are outdoor PMV1/2 normal?
1. Connector connection
2. Cabling
3. Coil
4. Valve body
5. I/F P.C. board
YES
Operation starts.
Are SV41 and
Valve circuits normal?
1. Misinstallation installation and
connector connection of SV41
and SV42
2. Leakage from SV41, 42 circuit
YES
Does not refrigerant
bypass from discharge of
suction through 4-way valve?
NO
Is compressor normal? (Note 2)
YES
Refrigerant shortage,
clogging, pipe breakage
Check code name

Compressor 1 case thermo operation

Compressor 2 case thermo operation

NO
(Note 1)
1. Case thermo is usually closed.
2. Operation temperature of case thermo is 120˚C.
NO
NO
Connector CN300, 301, White
NO
SV4 valve: Connector CN311, Blue
YES
NO
(Note 2)
Check the following items mainly.
1. Existence of abnormal sound and abnormal vibration during operation at start time
2. Abnormal overheat of case during operation or stop (Never touch with hands.)
3. Current of compressor lead during operation or starting (No rapid current change)
(After checking there is no slogging or pipe breakage, charge refrigerant again.)
1. Case thermo circuit error
2. I/F P.C. board error
3. Service valve closed
4. Outdoor PMV clogging
5. SV4 valve leak, Coil misinstallation
6. 4-way valve error
7. Compressor error
8. Refrigerant shortage
173
Cause of operation
Repair case thermo circuit.
Open service valves fully.
Repair outdoor PMV.
Correct SV4 valve circuits.
Check 4-way valve.
Compressor error