196
TROUBLESHOOTING
14) Gas Heat Pump is Pperating but Not Heating
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 malfunction
(Sensor judges the room temperature higher than
the actual value, and temperature control is not
turned on.)
Refer to P231, 56)Check for Readings
of the Indoor Temperature Sensors
Short circuit
The
compressor is
operating, but
fails to output
the rated
performance
※ 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
Thermostat
operation failure
Thermostat failure
Refer to P216, 25)Inspect Thermostat
Blockage in the engine coolant flow path
Insufficient air flow
volume
Intake air tempera-
ture is too low
Outdoor fan failure
Refer to P217, 27)Inspect Outdoor
Fan Motor
Clogged fins Clean heat exchanger fins
Short circuit
Insufficient refrig-
erant circulation
amount
Insufficient refrigerant amount
Refer to P222, 36)Inspect Refrigerant
Pressure (Inspect Refrigerant
Amount)
Blocked indoor electronic expansion valve
Refer to P224, 42)Inspect for Block-
age in the Indoor Electronic Expan-
sion Valve
Blocked strainer Refer to P224, 44)Inspect Strainer
Indoor electronic
expansion valve
operation failure
Indoor electronic expansion valve failure
Refer to P224, 42)Inspect for Block-
age in the Indoor Electronic Expan-
sion Valve
Hot gas bypass
valve operation
failure
Hot gas bypass valve failure
Refer to P223, 40)Inspect Hot Gas By-
pass Valve
Outdoor heat
exchanger liquid
flow control valve
operation failure
Outdoor heat exchanger liquid flow control valve
failure
Refer to P226, 48)Inspect Outdoor
Heat Exchanger Liquid Flow Control
Valve
Sub heat exchang-
er liquid flow
control valve oper-
ation failure
Sub heat exchanger liquid flow control valve failure
Refer to P225, 47)Inspect Sub Heat
Exchanger Liquid Flow Control Valve
Equipment
protection
function is
operating
Protection circuit for the refrigerant system is engaged, and avoidance
control is active
Check protection circuit engagement
status or avoidance control operation
Indoor heat
exchange
failure
Insufficient air flow
volume
Dust or dirt on the indoor air filters
Clean indoor air filters
Clogged 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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