194
TROUBLESHOOTING
13) Gas Heat Pump is Operating but Not Cooling
Problem Possible Cause Specific Example Inspection and Treatment
The
compressor
clutch is not
engaged
Compressor clutch
operation failure
Compressor clutch failure
Refer to P232, 61)Inspect Compressor
Clutch
Contact failure
Output failure
Sensor/Harness
system failure
Indoor intake air temperature sensor malfunc-
tion (Sensor judges the room temperature
lower than the actual value and the tempera-
ture control is not turned on.)
Refer to P231, 56)Check for Readings
of the Indoor Temperature Sensors
Heat exchanger temperature sensor malfunc-
tion (Sensor judges the heat exchanger tem-
perature lower than the actual value and the
freezing prevention control is turned on in
cooling.)
Compressor
operates, but
there is no cool
air flow
※ Measure the refrigerant pressure and temperature during operation,
and check the refrigerant cycle.
Refer to P222, 36)Inspect Refrigerant
Pressure (Inspect Refrigerant Amount)
Refer to P231, 55)Check Operation
Condition
Inappropriate
refrigerant amount
Insufficient filling
Refer to P222, 36)Inspect Refrigerant
Pressure (Inspect Refrigerant Amount)
Refrigerant leakage
Refrigerant flow path
failure (Warm air is
coming out)
Reversing valve failure
Refer to P227, 49)Inspect Reversing
Valve
Other refrigerant flow path failure
Indoor electronic
expansion valve
operation failure
Indoor electronic expansion valve failure
Refer to P224, 42)Inspect for Blockage
in the Indoor Electronic Expansion
Valve
Hot gas bypass valve
operation failure
Hot gas bypass valve failure
Refer to P223, 40)Inspect Hot Gas By-
pass Valve
Subcooling valve
operation failure
Subcooling valve failure
Refer to P231, 55)Check Operation
Condition
Sub heat exchanger
liquid flow control
valve operation failure
Sub heat exchanger liquid flow control valve
failure
Refer to P225, 47)Inspect Sub Heat Ex-
changer Liquid Flow Control Valve
Equipment pro-
tection function
is operating
Protection circuit for the refrigerant system is engaged, and avoidance
control is active
Check protection circuit engagement sta-
tus or avoidance control operation
Room temperature
has lowered extremely
(Freezing prevention
control for the indoor
heat exchanger is
activated)
Blocked indoor electronic expansion valve
Refer to P224, 42)Inspect for Blockage
in the Indoor Electronic Expansion
Valve
Blocked strainer Refer to P224, 44)Inspect Strainer
Blockage in the other refrigerant flow path failure
Indoor heat
exchange
failure
Insufficient air flow vol-
ume
Dust or dirt on the indoor air filters Clean indoor air filters
Clogged heat exchanger fins Clean heat exchanger fins
Indoor fan motor
operation failure
Indoor fan motor failure
Refer to P224, 41)Inspect Indoor Fan
Motor
Indoor fan capacitor failure
Output failure
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