9 | Troubleshooting
User reference guide
57
CVXM-A, FVXM-A, CVXM-A9, FVXM-A9, FVXTM-A
Split system air conditioners
4P625990-1D – 2022.09
9.2.1 Symptom: Airflow temperature is NOT high enough during Heat plus operation
▪ When the outdoor temperature is low and falls below freezing point, the airflow
temperature may be insufficient.
▪ During multi-room operation with multi outdoor unit connection, discharge air
temperature may be unable to reach a sufficient value.
9.2.2 Symptom: A sound like water flowing is heard
▪ This sound is caused by the refrigerant flowing in the unit.
▪ This sound may be generated when water is flowing away from the unit during
cooling or drying operation.
9.2.3 Symptom: A blowing sound is heard
This sound is generated when the direction of the refrigerant flow is changed (e.g.
when switching from cooling to heating).
9.2.4 Symptom: A ticking sound is heard
This sound is generated when the unit slightly expands or contracts with changes in
temperature.
9.2.5 Symptom: A whistling sound is heard
This sound is generated by the refrigerant flowing during defrost operation.
9.2.6 Symptom: A clicking sound during operation or idle time is heard
This sound is generated when the refrigerant control valves or electrical parts
operate.
9.2.7 Symptom: A clapping sound is heard
This sound is generated when an external device sucks air out of the room (e.g.
exhaust fan, extractor hood) while the doors and windows in the room are closed.
Open the doors or windows, or turn off the device.
9.2.8 Symptom: White mist comes out of a unit (Indoor unit)
▪ When humidity is high during cooling operation (in oily and dusty places). If the
interior of an indoor unit is extremely contaminated, the temperature
distribution inside a room becomes uneven. It is necessary to clean the interior
of the indoor unit. Ask your dealer for details on cleaning the unit. This operation
requires a qualified service person.
▪ When the air conditioner is changed over to heating operation after defrost
operation. Moisture generated by defrost becomes steam and exits.
9.2.9 Symptom: The units can give off odours
The unit can absorb the smell of rooms, furniture, cigarettes, etc., and then emit it
again.
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