Mitsubishi Electric PU-P71VHA Service Manual page 43

[for wireless remote controller]
Before you call out a repair man, check the following table to see whether there is a simple solution to your problem.
Problem
Unit does not operate at all.
Unit discharges air well, but fails to
cool or heat the room well.
Unit does not start immediately.
NOTE: After a power cut, the unit will not restart automatically. You will have to restart it by pressing the POWER - ON/OFF button
on the remote controller.
If none of the above apply, turn the main switch off and contact the dealer from whom you bough the air-conditioner, telling him the model
name and the nature of the problem. Do not try to fix the unit yourself.
In any of the following cases, turn off the main power switch and contact your local dealer for service:
• The operation lamp (on the main unit) flashes.
• The switches do not work properly.
• The circuit breaker trips frequently (or the fuse blows frequently).
• Water has accidentally been splashed into the unit.
• Water leaks from the unit.
• Something is accidentally dropped into the air-conditioner.
• An unusual noise is heard during operation.
The following do not indicate any malfunction:
·Odours
·Sound of liquid flowing inside indoor unit
·Ticking sound coming from indoor unit
·The CENTRALLY CONTROLLED indicator
appearing on the LCD panel
Display reading
When POWER ON/OFF button is
pushed, there is not beep and
nothing is displayed.
Liquid-crystal display indicates that
the unit operates.
Liquid-crystal display indicates that
the unit operates.
:Smells such as tobacco or cosmetic odours may persist after they have been sucked into
the unit.
:This can occur during or after operation and is simply the sound of refrigerant being
circulated inside the unit.
:This can occur when cooling or heating has just begun or has just stopped. It is caused by
the indoor unit shrinking or expanding slightly due to the change in temperature.
: From time to time, this message may come up on the LCD panel.
This does not indicate any malfunction.
43
Cause
Main power switch is turned off.
Main power fuse has blown.
Outdoor unit`s ground fault breaker
is open.
A power cut has occurred (see
NOTE below).
Improper temperature setting.
Filters are clogged.
Outdoor unit`s intake or outlet is
obstructed.
A door or window has been open.
Unit is waiting three minutes
before restarting.
Solution
Turn main power on. Then press
the POWER ON/OFF button to
turn the unit on.
Replace the fuse.
Replace the ground fault breaker.
Wait until power is restored, then
press the POWER ON/OFF button
to turn the unit on.
After checking the temperature
setting.
Clean the filter and resume opera-
tion.
Remove the obstruction.
Shut door or window.
Wait until the unit restarts automat-
ically. The compressor may hesi-
tate resuming because a three-
minute resume prevention circuit is
incorporated in the outdoor unit for
protection of the compressor.