Mitsubishi Electronics PEH-P16, 20-MYA, PEH-P10, PEH-P8 operation manual Troubleshooting

6. Troubleshooting

Before you call out a repair man, check the following table to see whether there is a simple solution to your problem.

●Unit does not cool or heat very well.

•Clean the filter. (Dust and debris that collects in the filter will decrease air- flow.)

•Check the temperature setting and adjust it if necessary.

•Increase the space surrounding the outdoor unit. Is the air intake or air outlet blocked?

•Is a window or door open?

●The unit does not blow air out right away in the heating mode.

•The unit is preparing to deliver warm air.

●The unit stops operating before arriving at the set temperature in the heating mode.

•Frost forms when the outdoor temperature is low and humidity is high. Wait for about 10 minutes for the frost to melt.

●There is a “swishing” noise that occurs from the unit when water flows.

•This sound is made when refrigerant inside of the unit is flowing or refilling.

●A ticking noise is heard from inside of the unit.

•This sound is made when internal parts of the unit expand or contract when the temperature changes.

●An odor is detected in the room.

•This is caused when the unit expels odors that have been absorbed from the walls, carpets, furniture or clothing.

●A white mist is expelled from the indoor unit.

•This may occur just after the unit is turned on when a high level of humidity is present in the room.

●Water or moisture is expelled from the outdoor unit.

•This occurs to expel water or moisture that may have collected in the pipes or around piping fixtures.

•This occurs to dispel water from the heat exchanger.

●The indicators of the remote controller do not light up when operated.

•Turn on the power switch. “ · ” will be displayed.

●CENTRALLY CONTROLLED is displayed in the remote controller.

•The start and stop functions of the remote controller are not available when the CENTRALLY CONTROLLED message is lit.

●The start and stop functions are not available just after restarting the unit.

•Wait about three minutes (operation has stopped to prevent damage to the air conditioner).

●The unit started even though the start/stop button was not pushed.

•Is the timer on?

Press the start/stop button to stop the unit.

•Was a distant command sent from the remote controller? Find out if the remote controller was used.

•Is the CENTRALLY CONTROLLED message lit? Find out if the remote controller was used.

•Is the automatic (cooling/heating) mode selected? Press the start/stop button to stop the unit.

●The unit stopped even though the start/stop button was not pushed.

•Is the timer on?

Press the start/stop button to restart the unit.

•Was a distant command sent from the remote controller? Find out if the remote controller was used.

•Is the CENTRALLY CONTROLLED message lit? Find out if the remote controller was used.

●The remote controller’s timer cannot be set.

•Set the schedule timer if one is connected.

●“HO” is displayed in the remote controller.

•An automatic startup test is being performed (will last for about two minutes).

●An error code is displayed in the remote controller.

•A self-diagnostic function is being performed to preserve the air conditioner.

*Do not attempt to make repairs yourself. Turn the main switch off and contact the dealer from whom you bought the air conditioner. Provide him or her with the name of the unit and the information displayed in the re- mote controller.

●No display appears on the wireless remote controller. Signals are not received by the thin sensor unless sent from close up.

•The batteries are becoming weak.

Replace the batteries and press the reset button.

*If the display does not appear after replacing the batteries, make sure that the (+, –) cells are aligned correctly.

●The operating display of the wireless remote controller’s receiver is flashing.

•A self-diagnostic function is being performed to preserve the air conditioner.

*Do not attempt to make repairs yourself. Turn the main switch off and contact the dealer from whom you bought the air conditioner. Provide him or her with the name of the unit.

●The fan in the indoor unit does not operate.

•Check the over-current relay on the fan motor to determine whether it has been tripped.

If the over-current relay has been tripped, reset it after eliminating the cause of the problem (e.g. motor lock).

To reset the over-current relay, open the control box and press the green claw on bottom-right of the relay until a click is heard. Release the claw and check that it returns to its original position.

Note that if it is pressed too hard it will not return to its original position.

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7. Troubleshooting [for wireless remote controller (option)]

Before you call out a repair man, check the following table to see whether there is a simple solution to your problem.

Problem	Solution	Problem	Solution
Unit does not operate at all.	Turn main power on. Then press the	Unit does not start immediately.	Wait until the unit restarts automatically.
	POWER ON/OFF button to turn the unit		The compressor may hesitate resuming
	on.		because a three-minute resume preven-
	Wait until power is restored, then press		tion circuit is incorporated in the outdoor
	the POWER ON/OFF button to turn the		unit for protection of the compressor.
	unit on.

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 bought 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: smells such as tobacco or cosmetic odours may persist after they have been sucked into the unit.

Sound of liquid flowing inside indoor unit: this can occur during or after operation and is simply the sound of refrigerant being circulated inside the unit.

Ticking sound coming from indoor 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.

The message “CENTRALLY CONTROLLED” appearing on the LCD panel: from time to time, this message may come up on the LCD panel. This does not indicate any malfunction.

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