Mitsubishi Electric PUZ-SM100VKA2 Service Manual page 42

Phenomena
4. Even controlling by the wireless
remote controller, no beep is
heard and the unit does not start
operating. Operation display is
indicated on wireless remote
controller.
5. When operating by the wireless
remote controller, beep sound is
heard, however, unit does not start
operating.
6. Remote controller display works
normally and the unit performs
cooling operation, however, the
capacity cannot be fully obtained.
(The air does not cool well.)
7. For 3 minutes after temperature
adjuster turns off, the compressor
will not start operating even if
temperature adjuster is turned on.
For 3 minutes after temperature
adjuster turns on, the compressor
will not stop operating even if
temperature adjuster is turned off.
(Compressor stops operating
immediately when turning off by
the remote controller.)
OCH774A
Factor
The pair number settings of the wireless remote
controller and indoor controller board are
mismatched.
No operation for 2 minutes at most after the power
supply ON
Local remote controller operation is prohibited.
• Remote controlling adaptor is connected to CN32
on the indoor controller board.
• Local remote controller operation is prohibited by
centralized controller etc. since it is connected to
MELANS.
Phenomena of No.2
Refrigerant shortage
Filter clogging
Heat exchanger clogging
Air duct short cycle
Normal operation
(For protection of compressor)
42
Countermeasure
Check the pair number settings.
Normal operation
Normal operation
Check the phenomena No.2.
• If refrigerant leaks, discharging
temperature rises and LEV opening
increases. Inspect leakage by checking
the temperature and opening.
• Check pipe connections for gas
leakage.
Open intake grille and check the filter.
Clean the filter by removing dirt or dust
on it.
• If the filter is clogged, indoor pipe
temperature rises and discharging
pressure increases. Check if heat
exchanger is clogged by inspecting
discharging pressure.
• Clean the heat exchanger.
Remove the blockage.
Normal operation