Mitsubishi Electric PUZ-ZM60VHA2, Service Manual

Page: 58 / 140

58
OCH771
• Before repair
Frequent calls from customers
Phone Calls From Customers How to Respond Note
Unit does
not operate
at all.
1
The operating display
of remote controller
does not come on.
1
Check if power is supplied to air conditioner.
Nothing appears on the display unless power is
supplied.
—
2
Unit cannot be
restarted for a while
after it’s stopped.
2
Wait around 3 minutes to restart unit.
The air conditioner is in a state of being protected by
the microcomputer’s directive. Once the compressor
is stopped, the unit cannot be restarted for 3 minutes.
This control is also applied when the unit is turned on
and off by remote controller.
—
3
Check code appears
and blinks on the
display of remote
controller.
3
Check code will be displayed if any protection devices
of the air conditioner are actuated.
What is check code?
Refer to "SELF-
DIAGNOSIS ACTION
TABLE".
Check if servicing is
required for the error.
Remote
controller
1
"Please Wait" is
displayed on the
screen.
1
Wait around 2 minutes.
An automatic startup test will be conducted for 2
minutes when power is supplied to the air conditioner.
"Please Wait" will be kept displayed while that time.
—
2
" " is displayed on
the screen.
2
This indicates that it is time to clean the air filters.
Clean the air filters. " " can be cleared from the filter
information of the maintanace menu. See the operation
manual that came with the product for how to clean the
filters.
Display time of " "
depends on the model.
Long life filter: 2500 h
Standard filter: 100 h
3
"STANDBY" is
displayed on the
screen.
3
This is displayed when the unit starts HEAT
operation, when the thermostat puts the
compressor in operation mode, or when the
outdoor unit ends DEFROST operation and
returns to HEAT operation.
The display will automatically disappear around 10
minutes later.
While "STANDBY" is displayed on the remote controller,
the airflow amount will be restricted because the indoor
unit’s heat exchanger is not fully heated up. In addition
to that, the up/down vane will be automatically set to
horizontal blow in order to prevent cold air from directly
blowing out to human body. The up/down vane will
return to the setting specified by the remote controller
when "STANDBY" is released.
—
4
"DEFROST" is
displayed on the
screen. (No air comes
out of the unit.)
4
The outdoor unit gets frosted when the outside
temperature is low and the humidity is high.
"DEFROST" indicates the DEFROST operation is being
performed to melt this frost. The DEFROST operation
ends in around 10 minutes (at most 15 minutes).
During the DEFROST operation, the indoor unit’s
heat exchanger becomes cold, so the fan is stopped.
The up/down vane will be automatically set to
horizontal blow in order to prevent cold air from directly
blowing out to human body. The display will turn into
"STANDBY" when DEFROST operation ends.
—