Mitsubishi Electric PUHZ-P200YHA Service Manual page 38

Phenomena
4. Even controlled 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 is not cool enough.)
7. Remote controller display works
normally and the unit performs
heating operation, however, the
capacity cannot be fully obtained.
8. 1 For 3 minutes after temperature
adjuster turns off, the compressor
will not start operating even if
temperature adjuster is turned on.
2 For 3 minutes after temperature
adjuster turns on, the compres-
sor will not stop operating even
if temperature adjuster is turned
off. (Compressor stops operating
immediately when turning off by
the remote controller.)
OCH424E
Factor
1 The pair number settings of the wireless remote
controller and indoor controller board are mismatched.
1 No operation for 2 minutes at most after the power
supply ON.
2 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
centralised controller etc. since it is connected to
MELANS.
3 Phenomena of No.2.
1 Refrigerant shortage
2 Filter clogging
3 Heat exchanger clogging
4 Air duct short cycle
1 Linear expansion valve fault
Opening cannot be adjusted well due to linear
expansion valve fault.
2 Refrigerant shortage
3 Lack of insulation for refrigerant piping
4 Filter clogging
5 Heat exchanger clogging
6 Air duct short cycle
7 Bypass circuit of outdoor unit fault
12Normal operation
(For protection of compressor)
1 Check the pair number settings.
12 Normal operation
3 Check the phenomena of No.2.
1• If refrigerant leaks, discharging tempera-
ture rises and LEV opening increases.
Inspect leakage by checking the tem-
perature and opening.
• Check pipe connections for gas leakage.
2 Open intake grille and check the filter.
Clean the filter by removing dirt or dust on
it.
3• If the filter is clogged, indoor pipe tem-
perature rises and discharging pressure
increases. Check if heat exchanger is
clogged by inspecting discharging pres-
sure.
• Clean the heat exchanger.
4 Remove the blockage.
1• Discharging temperature and indoor heat
exchanger temperature does not rise.
Inspect the failure by checking discharg-
ing pressure.
• Replace linear expansion valve.
2• If refrigerant leaks, discharging tempera-
ture rises and LEV opening increases.
Inspect leakage by checking the tem-
perature and opening.
• Check pipe connections for gas leakage.
3 Check the insulation.
4 Open intake grille and check the filter.
Clean the filter by removing dirt or dust on
it.
5• If the filter is clogged, indoor pipe tem-
perature rises and discharging pressure
increases. Check if heat exchanger is
clogged by inspecting discharging pres-
sure.
• Clean the heat exchanger.
6 Remove the blockage.
7 Check refrigerant system during operation.
12Normal operation
38
Countermeasure