No
No
No
No
No
No
No
No
(Check with miswiring check function of outdoor unit.)
No
No
No
No
No
No
Cleaning
Cleaning
[H06]
Check code
Cause
Check code name
Low-pressure protective operation
1. Service valve close
2. Ps sensor error
3. SV2, SV4 circuit error
4. Miswiring 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
Are
service valves of
gas and liquid pipe of
outdoor unit fully
opened?
Are
characteristics of
low-pressure sensor
normal?
Are
SV2 and SV4, SV14
circuits normal?
Is any indoor unit
in a different line
connected?
Does indoor
fan normally operate
in cooling season?
Is
there clogging of indoor
air filter or heat
exchanger?
Is indoor PMV
normal?
Is outdoor
fan normally operated in
heating season?
Is there
clogging of outdoor heat
exchanger?
Is outdoor PMV
normal?
Is connector
connection or coil
normal?
Is there clogging
on whole valve?
Are
following items
concerned to indoor fan
motor normal?
1. Connector connection
2. Condenser
3. Motor
4. Fan
Open service valves
fully.
Exchange low-pressure
sensor.
Correct SV2 ,SV4 and
SV14circuits.
Correct wiring.
Repair faulty parts.
Check indoor P.C. board.
Failure → Replace
Refrigerant shortage or clogging or pipe deformed
Repair faulty parts.
Repair faulty parts.
Refrigerant shortage,
clogging, pipe deformed
Replace PMV body.
Check outdoor I/F P.C. board.
Failure → Replace
In cooling season, go to (A)
In heating season, go to (B)
(A) Cooling
(B) Heating
Check miswiring, misinstallation and connector connection.
* 1. Pressure by pressure gauge (Check joint)
2. Pressure display on 7-segment display
3. Output voltage of I/F P.C. board(CN 500)
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.
Is indoor fan system normal?
. Fan crack
. Fan coming-off
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
No
No
No stagnation
No
Error
No
No leakage or
clogging
No clogging
No clogging
Stagnation
No error
Clogging
Clogging
Clogging
[H07]
Oil level down detection
protection
1. Valves of balance pipes closed. (On all outdoor
units in a line)
2. Miswiring or misinstallation of TK1 to TK5 sensors
3. TK1 to TK5 sensor error
4. Gas leak or oil leak in a line
5. Refrigerant stagnation of compressor case
6. SV3A, 3B, 3C, 3D, 3E, 3F valve error
7. Clogging of oil return circuit from oil separator
8. Clogging of oil-equation circuit system
Are
balance
pipe valves of all outdoor
units in same line fully
opened?
Are
TK1, TK2, TK3,
TK4 and TK5 sensors of the
error-detected unit correctly
connected? Are all the sensors
properly connected?
Are
characteristics of TK1 to
TK5 of error-detected unit
normal?
Check refrigerant
stagnation in
compressor.
(*1)
Check leakage of
valves (SV3A, SV3C) and
clogging (SV3B, SV3E,
SV3F).
(*2)
Check clogging
of oil returncircuit 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)
Are all oil levels
correct?
Open balance pipe valves
fully, reset power supply,
and start operation.
Sensor error → Replace
Specify gas leak position and
repair it.
(Recharging, refill oil)
Replace faulty part.
Replace faulty part.
Replace faulty part.
Replace faulty part.
Check gas leak of all outdoor
units in the same line and
check soaked oil in them.
Correct refrigerant stagnation
in compressor, reset power
supply, and start the operation.
Clear cause of stagnation.
Check clogging of oil
equalization circuit. (*4)
Check oil level judgment of each unit.
The check result is indicated on the
7-segment display by setting
[SW01/02/03] to [1/16/1].
Correct miswiring and misinstallation.
TK1: CN531, black
TK2: CN532, green
TK3: CN533, pink
TK4: CN534, yellow
TK5: CN535, red
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
Leakage or
clogging
*See "Outdoor unit temperature sensor
characteristics" on "9-9. Sensor Characteristics".
Check code
Cause
Check code name
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