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AISIN
Aisin gas heat pump
3.4.14 If Sufficient Heating Cannot Be Obtained
Trouble
Classification of
Likely Causes
Sub-Classification
Insufficient 1) Electromagnetic [1] Electromagnetic clutch malfunction
Trouble with the clutch itself
clutch of the
heating
Incomplete contact
compressor is
No output
Control section
not engaged.
[2] Indoor temperature sensor malfunction
Short-circuiting
Sensor fault
Check and Remedy
- See “(1) Checking the
electromagnetic clutch” in
3.3.13.
- See “(1) Checking the
temperature sensor” in
3.3.12.
(Adequate air conditioning cannot be obtained since
the indoor temperature is mis-judged to be higher
than its actual value.)
- Confirm circuit protector
2) Electromagnetic [1] Automatic activation of refrigerant circuit
clutch is
protector
status.
disengaged
immediately
No error is displayed until the refrigerant circuit protector has repeated its
after being
automatic activation and automatic resetting several times. During this
engaged.
automatic resetting cycle, therefore, the clutch is repeatedly engaged and
disengaged.
3) Improper indoor
unit heat
exchange
4) Sufficient
compressor
capabilities
cannot be
obtained.
[1] Insufficient ventilation
Indoor unit air filter clogging
Heat exchange fin clogging
- Clean the indoor unit air
filter.
[2] Improper indoor fan motor rotation
Abnormal output voltage
Fan capacitor malfunction
Fan motor malfunction
- Check the indoor fan
motor. See 3.3.9.
First, measure the refrigerant pressure and
temperature during operation and check the
refrigerant cycle.
[1] Insufficient heat exchange in evaporator
Hot-water heat collection failure
Continued flow of coolant into
radiator
Thermostat malfunction
Coolant circuit clogging
Failure to collect heat from hot air supply
Insufficient ventilation
Outdoor fan failure
Fin clogging
Short-circuiting
Too low intake air temperature
[2] Insufficient circulation of refrigerant
Shortage of refrigerant
Underfilling
Refrigerant leakage
Refrigerant channel clogging
Expansion valve sticking
Dryer filter clogging
[3] Indoor unit electronic expansion valve
malfunction
[4] Hot-gas bypass valve does not close
3-61
- Check the operational
status.
- Check the thermo valve.
See (4) in 3.3.5 and (1) in
3.3.12.
- See “(6) Checking outdoor
fan motors” in 3.3.5.
- Clean the heat exchanger
fins.
- See “(1) Checking the
amount of refrigerant” in
3.3.10.
- See “(3) Checking the
indoor electronic expansion
valve for clogging” in
3.3.10.
- See “(2) Checking the
dryer filter for clogging” in
3.3.10.motor.
- See “(6) Checking the
electronic expansion
valves” in 3.3.8.
- Check the hot-gas bypass
valve.