Mitsubishi Electric FRESH MASTER GUF-50RD4 User Manual

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ENGLISH
6. Troubleshooting
Before you ask for repair service, check the following points:
State of Machine Remote Controller Cause Troubleshooting
It does not run.
“
” display is not lit up
No display appears even
when the [ON/OFF] but-
ton is pressed.
Power failure Press the [ON/OFF] button after power
restoration.
The power supply is turned OFF. Turn the power supply ON.
The fuse in the power supply is gone. Replace fuse.
The earth leakage isolator is gone. Put in the earth leakage isolator.
Cool air or warm air does
not come out.
Theliquidcrystaldisplay
shows that it is in opera-
tion.
The restart-preventing circuit is in
operation for 3 minutes.
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.)
Fresh Master operation is started
during the heating and defrosting
operation.
Wait for a while.
(Heating operation starts after ending de-
frosting operation.)
Itrunsbriey,butsoon
stops
The “check” and check
codeashesontheliquid
crystal display.
There are some obstacles at the air
inlet and outlet of the Fresh Master
and outdoor unit.
Rerun after removal
Theltersarelledwithdustanddirt. Rerunaftercleaningthelters.(Referto
page 10 [Cleaning the machine].)
Do not humidify (GUF-50,
100RDH4 only)
The Fresh Master is not set to the
“heating” mode.
Set to the “heating” mode.
Water is not supplied. Open the service valve.
- 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ashes,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owinginsidethe
FreshMaster.Theproblemisinsignicant.
- 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inationandcontractioncausedbytemperaturechange.Theproblemisinsignicant.
- ItisrecommendedthattheairblownoutfromtheFreshMasterbedirectedtotheairconditionerrst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
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.
Rod for removal of the
humidifying elements
(original position)
Check after inspection
1. Open the service valve as necessary.
- Sincehumidicationisnotneededduringthesummer,itis
recommended that the service valve be closed.
2. During the winter, the season requiring humidication, make
sure that the power to the heater for prevention of freezing is
on.
3. Conduct a test and conrm that there is no water leakage.

Mitsubishi Electric FRESH MASTER GUF-50RD4 Specifications

General

Brand	Mitsubishi Electric
Model	FRESH MASTER GUF-50RD4
Category	Air Conditioner
Language	English