Troubleshooting - Mitsubishi MJ-E16VX-S1 Service Manual

11. Troubleshooting

Symptom
The unit blows warm air
Water does not collect in
the water tank (minimal
dehumidifying results)
The unit does not operate
(no air comes out)
The unit stops
The unit continues to operate
even though it is turned off
The humidity level does
not reach the level set
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.
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Stops after a
short time
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Louvre does
not swing
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Lights
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Indicates
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Cause/Remedy
Dehumidified air passes through heating coils causing it to warm
(this unit is not a cooler). This is not a malfunction.
Check to see if the temperature/humidity is low.
Low room temperature/humidity reduces dehumidifying
effectiveness. Confirm the current humidity reading (in winter, the
air is dry reducing the amount of water collected). This is not a
malfunction.
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.
Check to see if the pre-filter is clogged.
➝ Clean according to the maintenance procedures.
Is the unit operating in LAUNDRY mode?
➝ The unit may stop in one hour if the room temperature is about
5°C or less.
Check to see if the unit is in EASY DEHUMIDIFYING, MILDEW
GUARD, or AUTO.
The unit is automatically controlling the dehumidifier, fan, and standby times.
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 dehumidifier and blower functions stop
during defrosting.
Is the unit set to internal drying mode?
This function activates automatically after ending operations.
Check to see if the room is not too large.
➝ Use within effective boundaries (floor space).
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.
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 final product testing at the factory. It is not a
result of a malfunction.
The residue is from debris in the air.
➝ Clean according to the maintenance procedures.