Remote Controller Diagnosis; The Following Symptom Do Not Represent Trouble (Emergency) - Mitsubishi Electric PUMY-P250YBM Technical & Service Manual

8-2. REMOTE CONTROLLER DIAGNOSIS

Refer to 12-8. "REMOTE CONTROLLER CHECK" for MA remote controller system.

8-3. 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 ˝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.
OCH760
Display of remote controller
˝Cooling (Heating)˝ blinks
Normal display
Normal display
˝Heat Defrost ˝
Light out
˝Heat Standby ˝
˝Please Wait˝ blinks
Light out
—
93
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 because 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 stops during defrosting.
Fan runs 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 reaches 35°C. Then low speed operates for
2 minutes and operates at the normal set air volume.
(Hot adjust control)
The system is in the process of startup.
Operate remote controller again after ˝Please Wait˝ disappears.
After a stop of cooling operation, unit continues to operate drain
pump for 3 minutes and then stops.
Unit continues to operate drain pump if drainage is generated,
even during a stop.
Cause