Mitsubishi Electric MJ-E15BX-A1 Service Manual download pdf (Page 24)

10. Troubleshooting

For the symptoms listed below, refer to the remedies listed right.z

Air passed through the re-heating coil is warm. z

Unlike an air conditioner, the unit is not capable of cooling a whole room.

Using the unit in a closed room will instead cause the room temperature to rise.

When the unit is set to COOL AIR/VARY or COOL AIR/LOW, warm air is

blown from the back air outlet.

The unit blows warm air

The unit does not blow warm

air

The unit does not blow cool

air

Check to see if the temperature/humidity is low.

Low room temperature/humidity reduces dehumidifying effectiveness. This is

not a malfunction.

Water does not collect in

the water tank (minimal

dehumidifying results)

Check to see if the power cord is correctly plugged.

Plug the power cord properly into the power socket.

Check to see if anything is blocking the air intake or outlet.

Remove the obstruction.

→

Is operation being performed with the unit set to

DEHUMIDIFYING

AUTO?

The unit is automatically switching dehumidifying, blowing, and stopping.

→

Check to see if the silver ion ﬁ lter is clogged.

Clean according to the maintenance procedures.

→

Is operation being performed with the unit set to

LAUNDRY

NORMAL or HEAVY?

If the room temperature is approximately 5°C or less, operation stops after

approximately 1 hour. If the room temperature is low, it becomes difﬁ cult for

water to evaporate from clothes because the humidity does not change.

→

Is operation being performed with the unit set to DEO-DRY?

This operation is designed to end after approximately 1 hour.

→

Check to see if the water tank is full.

Empty the water tank and return it to its original position.

→

Check to see if the water tank is inserted properly.

Adjust the position of the water tank.

→

Check to see if the unit is in defrosting mode. The unit activates

defrosting mode when the room temperature drops below 15

C. The

dehumidiﬁ er and blower functions stop during defrosting.

The unit does not operate (No

air comes out and the louvre

does not swing)

The unit stops

Stops after

a short time

Indicates

Even if the POWER switch is turned off, the blower fan rotates for

approximately 2 minutes to prevent the temperature inside the unit from

rising. Wait until the blower fan stops before removing the power plug.

Is the unit set to drying inside mode?

This function activates automatically after ending operations.

The unit continues to operate

even though it is turned off

Check to see if the room is not too large.z

Check to see if the exits to the room are open.

Refrain from opening doors/windows during operation.

→

Check to see if steam producing appliances such as kerosene heaters are on in the vicinity.

The humidity level does not

drop easily

Hygrometer readings differ from place to place even if in the same room. Use

the unit humidity reading as an estimate.

The hygrometer reading on

the unit differs from other

hygrometers in the room

The residue is from debris in the air.

Clean according to the maintenance procedures.

→

There is black residue on the

inside of the water tank and lid.

The residue is from ﬁ nal product testing at the factory. It is not a result of a

malfunction.

The water tank contains liquid

or white water residue

Press the Swing louvre switch again.

The louvre does not move as set

Symptom Cause/Remedy

Is operation being performed with the unit set to other than

COOL AIR/VARY or COOL AIR/LOW?

Perform operation with the unit set to

COOL AIR/VARY or COOL AIR/LOW.

→

SPOT AIR

Is operation being performed with the unit set to other than

WARM AIR?

Perform operation with the unit set to

WARM AIR.

→

SPOT AIR

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Mitsubishi Electric MJ-E15BX-A1 Service Manual Page 24

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