The Following Symptoms Are Normal - Mitsubishi Electric City Multi PUHY-P500YSHM-A Service Handbook

[ IX Test Run Mode ]

[6] The following symptoms are normal.

Symptoms
The indoor unit does not start
after starting cooling (heating)
operation.
The auto vane adjusts its posi-
tion by itself.
The fan stops during heating
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.
Indoor unit and BC controller
make noise during cooling/
heating changeover.
Sound of the refrigerant flow is
heard from the indoor unit im-
mediately after starting opera-
tion.
HWE07150
Remote controller
display
"Cooling (heating)" The unit cannot perform a heating (cooling) operation when other indoor
icon blinks on the units are performing a cooling (heating) operation.
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.
Normal display 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 remains stopped during defrost operation.
Defrost
The system is starting up. Wait until the blinking display of "HO" or
"HO" or "PLEASE "PLEASE WAIT" go off.
WAIT" icons blink
on the display.
This noise is made when the refrigerant circuit is reversed and is normal.
Normal display
This is caused by the transient instability of the refrigerant flow and is nor-
mal.
Normal display
Cause
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