The Following Phenomena Do Not Represent Abnormality (Emergency) - Mitsubishi Electric CITY MULTI PUHY-YSMF-B Installationshandbuch

12.5. The following phenomena do not represent abnormality (emergency)

Phenomenon
Indoor unit does not the perform cool-
ing (heating) operation.
The auto vane runs freely.
Fan setting changes during heating.
Fan stops during heating operation.
Fan does not stop while operation has
been stopped.
No setting of fan while start SW has
been turned on.
Outdoor unit does not operate by turn-
ing switch on.
Indoor unit remote controller shows
"HO" indicator for about two minutes
when turning ON universal power sup-
ply.
Drain pump does not stop while unit has
been stopped.
Drain pump continues to operate while
unit has been stopped.
When the variable capacity unit is run-
ning, the fan of the constant capacity
unit runs even though the constant ca-
pacity unit isn't running.
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Display of remote controller
"Cooling (heating)" flashes
Normal display
Normal display
Defrost display
No lighting
Heat ready
Normal display
"HO" flashes
Light out
Normal display
Cause
When another indoor unit is performing the heating (cooling) opera-
tion, the cooling (heating) operation is not performed.
Because of the control operation of auto vane, it may change over to
horizontal blow automatically from the downward blow in cooling in case
the downward blow operation has been continued for 1 hour. At de-
frosting in heating, hot adjusting and thermostat OFF, it automatically
changes over to horizontal blow.
Ultra-low speed operation is commenced at thermostat OFF.
Light air automatically changes over to set value by time or piping tem-
perature at thermostat ON.
The fan is to stop during defrosting.
Fan is to run for 1 minute after stopping to exhaust residual heat (only
in heating).
Ultra low-speed operation for 5 minutes after SW ON or until piping
temperature becomes 35°C, low speed operation for 2 minutes there-
after, and then set notch is commenced. (Hot adjust control)
When the outdoor unit is being cooled and the refrigerant is resting,
warming up operation is performed for at least 35 minutes to warm the
compressor.
During this time, only the fan operates.
System is being driven.
Operate remote controller again after "HO" disappear.
After a stop of cooling operation, unit continues to operate drain pump
for three minutes and then stops it.
Unit continues to operate drain pump if drainage is generated, even
during a stop.
The fan of constant capacity unit is run automatically in order not to
accumulate the refrigerant.