Mitsubishi Electric PAA-A18AA1 Manual De Operación página 18

8. Troubleshooting
Having trouble
PAA unit does not heat or cool well.
When the unit starts heating, it takes
a while for the unit to start blowing
warm air.
During Heat mode, the PAA unit stops
before the set room temperature is
reached.
A flowing water sound or occasional
hissing sound is heard.
A cracking or creaking sound is
heard.
The room has an unpleasant odor.
A white mist or vapor is emitted from
the indoor unit.
Water or vapor is emitted from the
outdoor unit.
When restarting the PAA unit soon
after stopping it, it does not operate
right away.
"PLEASE WAIT" appears in the
remote controller display.
Specifications are subject to change without notice.
PAA-A18, 24, 30, 36, 42AA1/BA1/CA1
Here is the solution (Unit is operating normally)
Clean the furnace filter. (Airflow is reduced when the filter is
dirty or clogged.)
Check the temperature adjustment and adjust the set
temperature.
Make sure there is plenty of space around the outdoor unit.
Check if the indoor unit air intake or outlet is blocked, or if a
door or window has been left open.
Warm air does not blow until the indoor unit has sufficiently
warmed up.
When the outdoor temperature is low and the humidity is
high, frost may form on the outdoor unit. If this occurs,
the outdoor unit performs a defrosting operation. Normal
operation should resume after approximately 10 minutes.
These sounds can be heard when refrigerant is flowing in
the PAA unit or when the refrigerant flow is changing.
These sounds can be heard when parts rub against each
other due to expansion and contraction from temperature
changes.
The indoor unit draws in air that contains gases produced
from the walls, carpeting and furniture as well as odors
trapped in clothing, and then blows this air back into the
room.
If the indoor temperature and the humidity are high, this
condition may occur when operation starts.
During defrosting mode, cool airflow may blow down and
appear like a mist.
During Cool mode, water may form and drip from the cool
pipes and joints.
During Heat mode, water may form and drip from the heat
exchanger.
During Defrosting mode, water on the heat exchanger
evaporates and water vapor may be emitted.
Wait approximately 10 minutes. (Operation has stopped to
protect the PAA unit).
The initial settings are being performed. Wait approximately
3 minutes.
18 © 2022 Mitsubishi Electric US, Inc.