Mitsubishi Electric City Multi PFAV-P500VMH-E, Service Handbook

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[
IX
Test Run Mode ]
- 94 -
HWE07150 GB
[6] The following symptoms are normal.
Symptoms
Remote controller
display
Cause
The indoor unit does not start
after starting cooling (heating)
operation.
"Cooling (heating)"
icon blinks on the
display.
The unit cannot perform a heating (cooling) operation when other indoor
units are performing a cooling (heating) operation.
The auto vane adjusts its posi-
tion by itself.
Normal display
After an hour of cooling operation with the auto vane in the vertical posi-
tion, the vane may automatically move into the horizontal position.
Louver blades will automatically move into the horizontal position while
the unit is in the defrost mode, pre-heating stand-by mode, or when the
thermostat triggers unit off.
The fan stops during heating
operation.
Defrost
The fan remains stopped during defrost operation.
When the main power is
turned on, the display shown
on the right appears on the in-
door unit remote controller for
5 minutes.
"HO" or "PLEASE
WAIT" icons blink
on the display.
The system is starting up. Wait until the blinking display of "HO" or
"PLEASE WAIT" go off.
Indoor unit and BC controller
make noise during cooling/
heating changeover.
Normal display
This noise is made when the refrigerant circuit is reversed and is normal.
Sound of the refrigerant flow is
heard from the indoor unit im-
mediately after starting opera-
tion.
Normal display
This is caused by the transient instability of the refrigerant flow and is nor-
mal.