Troubleshooting - Mitsubishi Electric MJ-E15BX-S1-IT Service Manual

10.

Troubleshooting

For the symptoms listed below, refer to the remedies listed right.
Symptom
The unit blows warm air
The unit does not blow warm
air
The unit does not blow cool
air
Water does not collect in
the water tank (minimal
dehumidifying results)
The unit does not operate (No
air comes out and the louvre
does not swing)
The unit stops
The unit continues to operate
even though it is turned off
The humidity level does not
drop easily
The hygrometer reading on
the unit differs from other
hygrometers in the room
The louvre does not move as set
The water tank contains liquid
or white water residue
There is black residue on the
inside of the water tank and lid.
24
Air passed through the re-heating coil is warm.
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.
Is operation being performed with the unit set to other than
WARM AIR?
→
Is operation being performed with the unit set to other than
COOL AIR/VARY or COOL AIR/LOW?
→
Check to see if the temperature/humidity is low.
Low room temperature/humidity reduces dehumidifying effectiveness. This is
not a malfunction.
Check to see if the power cord is correctly plugged.
→
Check to see if anything is blocking the air intake or outlet.
→
Is operation being performed with the unit set to DEHUMIDIFYING AUTO?
→
Check to see if the silver ion fi lter is clogged.
→
Is operation being performed with the unit set to LAUNDRY NORMAL or HEAVY?
→
Stops after
a short time
Is operation being performed with the unit set to DEO-DRY?
→
Check to see if the water tank is full.
→
Check to see if the water tank is inserted properly.
Indicates
→
Check to see if the unit is in defrosting mode. The unit activates
defrosting mode when the room temperature drops below 15°C. The
Indicates
dehumidifi er and blower functions stop during defrosting.
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.
Check to see if the room is not too large.
Check to see if the exits to the room are open.
→
Check to see if steam producing appliances such as kerosene heaters are on in the vicinity.
Hygrometer readings differ from place to place even if in the same room. Use
the unit humidity reading as an estimate.
Press the Swing louvre switch again.
The residue is from fi nal product testing at the factory. It is not a result of a
malfunction.
The residue is from debris in the air.
→
Cause/Remedy
Perform operation with the unit set to
Perform operation with the unit set to
Plug the power cord properly into the power socket.
Remove the obstruction.
The unit is automatically switching dehumidifying, blowing, and stopping.
Clean according to the maintenance procedures.
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.
This operation is designed to end after approximately 1 hour.
Empty the water tank and return it to its original position.
Adjust the position of the water tank.
Refrain from opening doors/windows during operation.
Clean according to the maintenance procedures.
SPOT AIR
WARM AIR.
SPOT AIR
SPOT AIR
COOL AIR/VARY or COOL AIR/LOW.
SPOT AIR