Troubleshooting - Mitsubishi Electric PK-2.5FLA Operation Manual

4. Troubleshooting

E
Before requesting repair staff, please check the following points.
Problem
Unit does not operate.
Unit does not start immediately.
4
Unit stops soon after starting.
Unit discharges air satisfactorily, but fails
to cool the room well.
* Once the unit stops due to a power failure, it will not re-start automatically even if the power is restored. To re-start the unit, press the
controller.
If the problem is still present even after the above points have been checked, turn the main switch off and contact the dealer from whom the unit was purchased. Give them the
model name and the nature of the problem. Never try to fix the unit yourself.
The following are not indicative of a malfunction:
Odors:
• Smells, such as tobacco, cosmetics, walls and furniture, contained in the room air have been collected on the air conditioner unit and are discharged.
Sound:
• A swishing sound is sometimes heard during or after operation. This sound is caused by liquid flowing inside the unit.
• A hissing sound is sometimes heard when cooling mode is started and stopped. This sound is caused by shrinking or expansion of the panel due to temperature change.
NOTE: The refrigerant charged in the air conditioner is safe. Refrigerant normally does not leak, however, if refrigerant gas leaks indoors, and comes into contact
with the fire of a fan heater, space heater, stove, etc., harmful substances will be generated.
Be sure to ask the service representative whether there is refrigerant leakage or not when repairs are carried out.
36
Remote controller
No pipping sound is heard nor display
made even if the ON/OFF button is
pressed.
LCD shows the unit is operating.
LCD shows the unit is operating.
Cause
Power failure (See Note*.)
Main power switch is turned off.
Main power fuse has blown.
Earth leakage breaker is activated.
Remote controller is operated outside its
operating range.
Remote controller's batteries have run out.
(" " is displayed on the remote control-
ler.)
Re-start prevention circuit is activated caus-
ing the unit to wait three minutes before re-
starting.
Indoor or outdoor unit's intake or outlet is
obstructed.
Filter is clogged with dust and dirt.
Temperature setting is incorrect.
Filter is clogged with dust and dirt.
Indoor or outdoor unit's intake or outlet is
obstructed.
Door or window is left open.
Solution
Press the ON/OFF button after the
power is restored.
Turn main power on.
Replace the fuse.
Reset the earth leakage breaker.
Operate the remote controller within its
operating range.
Replace the batteries with new ones.
Indoor unit is equipped with re-start pre-
vention circuit to protect condenser, thus
condenser may not operate immediately.
In this case, just wait a few minutes. You
may have to wait up to three minutes at
least.
Remove the obstruction.
Clean the filter and resume operation.
See "Cleaning the filters and the indoor
unit" on page 32.
Check the set temperature displayed on
the LCD, then adjust the temperature as
described in "Setting the Temperature"
using the TEMP button.
Clean the filter and resume operation.
See "Cleaning the filters and the indoor
unit" on page 32.
Remove the obstruction.
Close door or window.
ON/OFF button of the remote