Mitsubishi Electric Mr. Slim PUZ-M200YKA2.UK Service Manual page 42

Phenomena
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.
When operating by the wireless remote
controller, beep sound is heard,
however, unit does not start operating.
Remote controller display works
normally and the unit performs cooling
operation, however, the capacity cannot
be fully obtained. (The air does not cool
well.)
Remote controller display works
normally and the unit performs heating
operation, however, the capacity cannot
be fully obtained.
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.)
OCH775B
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
Linear expansion valve fault
Opening cannot be adjusted well due to linear
expansion valve fault.
Refrigerant shortage
Lack of insulation for refrigerant piping
Filter clogging
Heat exchanger clogging
Air duct short cycle
Bypass circuit of outdoor unit fault
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.
• Discharging temperature and indoor
heat exchanger temperature does not
rise.
Inspect the failure by checking
discharging pressure.
• Replace linear expansion valve.
• If refrigerant leaks, discharging
temperature rises and LEV opening
increases.
Inspect leakage by checking the
temperature and opening.
• Check pipe connections for gas leakage.
Check the insulation.
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.
Check refrigerant system during operation.
Normal operation