Troubleshooting - Mitsubishi Electric Fresh Master GUF-100RDH3 Operating Instructions Manual

How to install the humidifying elements
Install the humidifying elements in the reverse order of their re-
moval.
G For the GUF-100RDH3, return the rod for removal of the humidify-
ing elements to its original position, and then insert the humidifying
elements.
G Securely connect the water supply tubes and make sure there is
no water leakage.

6. Troubleshooting

Before you ask for repair service, check the following points:
State of Machine Remote Controller
"'" display is not lit up
No display appears
It does not run. even when the [ON/
OFF] button is
pressed.
Cool air or warm air The liquid crystal
does not come out. display shows that it
is in operation.
It runs briefly, but The "check" and
soon stops. check code flashes
on the liquid crystal
display.
Do not humidify
(GUF-50,
100RDH3 only)
• If operation stops due to a power failure, the [restart-preventing circuit at power failure] functions and disables operation, even after power
restoration. In this case, press the [ON/OFF] button again and start operation.
If malfunctions persist after you have checked the above, turn the power supply OFF and contact your dealer with information about the product
name, the nature of the malfunction, etc. If the display of "[check]" and (4 digit) check code flashes, tell the dealer contents of the display (check
code). Never attempt to repair by yourself.
The following symptoms are not the Fresh Master failures:
• The air blown out from the Fresh Master can sometimes give off odours. This is due to cigarette smoke contained in the air of the room, the smell
of cosmetics, the walls, furniture, etc., absorbed in the Fresh Master.
• A hissing noise can be heard immediately after the Fresh Master is started or stopped. This is the sound of the refrigeration flowing inside the
Fresh Master. The problem is insignificant.
• The Fresh Master sometimes snaps or clicks at the beginning or end of cooling/heating operation. This is the sound of friction on the metal
sections due to inflation and contraction caused by temperature change. The problem is insignificant.
• It is recommended that the air blown out from the Fresh Master be directed to the air conditioner first and then directed into the room. However,
the air may be directed from the Fresh Master to the room without going through the air conditioner. In this air-blowing method, cold air blows out
during heating operation in the cases listed below. In that case, please change the air-blowing method.
• At the start of an operation
• When an operation is restarted immediately after an operation has been stopped (within 3 minutes)
• During a defrosting operation of the outdoor unit
Rod for removal of the
humidifying elements
(original position)
Power failure
The power supply is turned OFF.
The fuse in the power supply is gone.
The earth leakage breaker is gone.
The restart-preventing circuit is in operation
for 3 minutes.
Fresh Master operation is started during the
heating and defrosting operation.
There are some obstacles at the air inlet and
outlet of the Fresh Master and outdoor unit.
The filters are filled with dust and dirt.
The Fresh Master is not set to the "heating"
––– mode.
Water is not supplied.
Check after inspection
1. Open the service valve as necessary.
G Since humidification is not needed during the summer, it is rec-
ommended that the service valve be closed.
2. During the winter, the season requiring humidification, make
sure that the power to the heater for prevention of freezing is
on.
3. Conduct a test and confirm that there is no water leakage.
Cause
Press the [ON/OFF] button after power restora-
tion.
Turn the power supply ON.
Replace fuse.
Put in the earth leakage breaker.
Wait for a while.
(To protect the compressor, a 3-minute restart-
preventing circuit is built into the Fresh Master.
Therefore, there are occasions sometimes when
the compressor does not start running immedi-
ately. There are cases when it does not run for
as long as 3 minutes.)
Wait for a while.
(Heating operation starts after ending defrosting
operation.)
Rerun after removal
Rerun after cleaning the filters. (Refer to page 10
[Cleaning for the machine].)
Set to the "heating" mode.
Open the service valve.
Troubleshooting
13