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172
Phenomenon which appears as result
(Corresponding indoor unit or flow selector unit)
Part name Trouble mode Operation mode
Correspon
din
g
indoor
unit
Not
cooled
Not
heated
May become
almost normal
capacity
l
Abnormal
cooling sound
¡
Circulating
sound
Detection of
check code
Judgment and position to be checked
Exam
p
le of
refrigerant
flow
Single cooling
Simultaneous cooling (Indoor cooling)
Simultaneous heating (Indoor cooling)
¡
l
Indoor unit,
Selector unit
• Operation is changed from heating to cooling.
Clogging
Single heating
Simultaneous cooling (Indoor heating)
Simultaneous heating (Indoor heating)
¡
l
Indoor unit,
Selector unit
• Refrigerant impact sound is heard at defrost time.
SVSS valve
Leakage
Single heating
Simultaneous cooling (Indoor heating)
Simultaneous heating (Indoor heating)
¡¡
SVSS circuit
• Refrigerant sound may be heard from SVSS valve
circuit.
• Temperature of suction gas pipe at outdoor side of the
selector unit is higher than that of normal selector unit.
Single cooling (SV11 ON)
Simultaneous cooling (Indoor cooling)
Simultaneous heating (Indoor cooling)
¡
Check valve
Capillary clogging
Single heating
Simultaneous cooling (Indoor heating)
Simultaneous heating (Indoor heating)
¡
P15
[Gas leak
detection]
• Gas short is observed and PD and PS may be lower
than those in normal time.
• TD and TS may be higher than those in normal time.
Dischar
g
e–Li
q
uid
bypass capillary,
Check valve
Check valve
leakage
Single cooling (SV11 OFF)
¡
¡
Check valve
circuit
• Refrigerant sound may be heard from check valve.
• Discharge gas pipe is cold or it may be frozen.
Piping
Discharge pipe
Liquid pipe
Gas pipe
Incorrect piping
Dischar
g
e pipe ↔
Suction gas pipe
Single cooling
Simultaneous cooling (Indoor cooling)
Simultaneous heating (Indoor cooling)
¡
• TCJ and TC1 are heated same as heating.
(Heating circuit)
• Discharge gas pipe at outdoor side of selector unit is
fairly heated.
In some cases, phenomena such as above occur.
Signal line
Power supply line
Disconnection
Contact error
Miswiring