Mitsubishi Electric City Multi PUMY-SP112VKM Technical & Service Manual page 101

8-2. THE FOLLOWING SYMPTOM DO NOT REPRESENT TROUBLE (EMERGENCY)
Symptom
Even the cooling (heating)
operation selection button
is pressed, the indoor unit
cannot be operated.
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.
Indoor unit remote controller
shows "HO" or "PLEASE
WAIT " indicator for about
2 minutes when turning
ON power supply.
Drain pump does not stop
while unit has been stopped.
Drain pump continues to
operate while unit has been
stopped.
OCH668B
Display of remote controller
"Cooling (Heating)" blinks
Normal display
Normal display
"Defrost "
Light out
STAND BY
"HO" blinks
"PLEASE WAIT" blinks
Light out
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101 101
The indoor unit cannot cool (heat) if other indoor units are heating
(Cooling).
Because of the control operation of auto vane, it may change over
to horizontal blow automatically from the downward blow in cooling
in cause the downward blow operation has been continued for 1
hour. At defrosting 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 change over to set value by time or piping
temperature 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 reach 35°C. There low speed operate for 2 minutes,
and then set notch is commenced. (Hot adjust control)
The system is in the process of start-up.
Operate remote controller again after "HO" or "PLEASE WAIT"
disappears.
After a stop of cooling operation, unit continues to operate drain
pump for 3 minutes and then stops it.
Unit continues to operate drain pump if drainage is generated, even
during a stop.
CAUSE