133
Check code
[H04] / [44]
(TCC-L / AI-NET)
Check code name
Compressor 1 case thermo operation
Cause of operation
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
(Note 1)
1. Case thermo is usually closed.
2. Operation temperature of case thermo is 120˚C.
(After checking there is no slogging or pipe breakage, charge refrigerant again.)
(Note 2) Check the following items mainly.
1. Existence of abnormal sound and abnormal vibration during operation or when starting
2. Abnormal overheat of case during operation or stop (Do not touch.)
3. Current of compressor during operation or starting (No rapid current change)
SV4 valve: Connector CN311, Blue
Connector CN300, White
Is compressor normal? (Note 2)
Is flow selector unit normal?
Repair case thermo circuit.
Are service valves of
gas pipe and liquid pipe of
outdoor unit fully opened?
Does not refrigerant
bypass from discharge to
suction through 4-way valve?
Refrigerant shortage,
clogging, pipe breakage
Is case thermo circuit normal?
1. Connector connection
2. Wiring
3. I/F P.C. board (Note 1)
Open service valves fully.
Repair outdoor PMV.
Correct SV4
valve circuits.
Check 4-way valve.
Check piping.
Compressor error
Start operation.
Are outdoor PMV normal?
1. Connector connection
2. Wiring
3. Coil
4. Valve body
5. I/F P.C. board
Are SV4
Valve circuits normal?
1. Incorrect installation and
connection of SV4
2. Leakage from SV4 circuit
NO
YES
YES
YES
YES
YES
YES
YES
NO
Check flow selector unit.
YES
NO
NO
NO
NO
NO
NO
Is not refrigerant bypassed
from discharge to suction?
Check code
[H06] / [20]
(TCC-L / AI-NET)
Check code name
Low-pressure
protective operation
Cause of operation
1. Service valve close
2. Ps sensor error
3. SV2, SV4 circuit error
4. Miscabling of communication between indoor and outdoor
5. Indoor/outdoor fan and condenser error
6. Indoor/outdoor PMV clogging
7. Indoor/outdoor heat exchanger clogging
8. Refrigerant shortage
*
1 Pressure by pressure gauge (Check joint)
2 Pressure display on 7-segment display
3 Output voltage of I/F P.C. board
If 1 and 2, 3 are different, an error of pressure sensor error is considered.
If 2 and 3 are different, check I/F P.C. board.
(Check with miswiring check function of outdoor unit.)
YES
YES
YES
YES
YES
YES
YES
NO
YES
NO
NO
NO
NO
NO
NO
NO
Open service valves fully.
Exchange low-pressure sensor.
Correct SV2 and SV4 circuits.
Correct cabling.
Are characteristics of low-pressure sensor normal?
Are SV2 and SV4 circuits normal?
Is indoor unit connected to different refrigerant systems?
Is the PMV Kit used?
Is outdoor PMV normal?
Is the PMV of “PMV Kit” normal?
Is indoor PMV normal?
Is connection or coil normal?
Is connection or coil normal?
Is there clogging of the valve?
Are service valves of gas and
liquid pipe of outdoor unit fully opened?
Does indoor fan operate
normally in cooling season?
Is there clogging of indoor
air filter or heat exchanger?
Is the PMV built in the indoor unit
made full open?
Is outdoor fan operating
normally in heating season?
Is there clogging of
outdoor heat exchanger?
(A) Cooling
Is the connection cable
between PMV Kit and indoor unit
connected certainly?
YES
NO
NO
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
NO
NO
YES
YES
YES
Check indoor P.C. board.
Failure
®
Replace
Repair faulty parts.
NO
NO
Repair faulty parts.
Repair faulty parts.
Repair faulty parts.
Connection
Replace PMV body.
Are following items normal?
1. Connection
2. Condenser
3. Motor
4. Fan
Cleaning
In cooling season, go to (A), in heating season, go to (B)
Check indoor I/F P.C. board.
Failure
®
Replace
Check outdoor I/F P.C. board.
Failure
®
Replace
NO
Check outdoor I/F P.C. board.
Failure
®
Replace
Refrigerant shortage or
clogging or pipe deformed.
PMV built in the indoor unit
is made full open.
(B) Heating
YES
Cleaning
Is indoor fan system normal?
• Fan cracked
• Fan loose
Refrigerant shortage or
clogging or pipe deformed.
Refrigerant shortage or
clogging or pipe deformed.