Troubleshooting - Mitsubishi Electric Fresh Master GUF-50RDH4 Operating Instructions Manual

How to install the humidifying elements
Install the humidifying elements in the reverse order of their
removal.
- For the GUF-100RDH4, return the rod for removal of the humidify-
ing elements to its original position, and then insert the humidify-
ing elements.
- 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
It does not run.
"
No display appears even
when the [ON/OFF] but-
ton is pressed.
Cool air or warm air does The liquid crystal display
not come out. shows that it is in opera-
tion.
It runs briefly, but soon The "check" and check
stops code flashes on the liquid
crystal display.
Do not humidify (GUF-50,
100RDH4 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. How-
ever, 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)
Remote Controller
Power failure
" display is not lit up
The power supply is turned OFF.
The fuse in the power supply is gone.
The earth leakage isolator 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.
- Since humidification is not needed during the summer, it is
recommended 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
restoration.
Turn the power supply ON.
Replace fuse.
Put in the earth leakage isolator.
Wait for a while.
(To protect the compressor, a 3-minute
restart-preventing circuit is built into the
Fresh Master. Therefore, there are occa-
sions sometimes when the compressor
does not start running immediately. There
are cases when it does not run for as long
as 3 minutes.)
Wait for a while.
(Heating operation starts after ending de-
frosting operation.)
Rerun after removal
Rerun after cleaning the filters. (Refer to
page 10 [Cleaning the machine].)
Set to the "heating" mode.
Open the service valve.
Troubleshooting
13