Service manual

42
Phenomena
Factor
Countermeasure
7. Remote controller display works nor-
mally and the unit performs heating
operation, however, the capacity
cannot be fully obtained.
1Linear expansion valve fault.
Opening cannot be adjusted well due to linear expan-
sion valve fault.
2Refrigerant shortage.
3Lack of insulation for refrigerant piping.
4Filter clogging.
5Heat exchanger clogging.
6Air duct short cycle .
7Bypass circuit of outdoor unit fault.
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.
3Check the insulation.
4Open suction grill 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.
6Remove the shield.
7Check refrigerant system during operation.
8. 1For 3 minutes after temperature
adjuster turns off, the compressor
will not start operating even if
temperature adjuster is turned on.
2For 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.)
12Normal operation.
(For protection of compressor)
12Normal operation
5. When operating by the wireless
remote controller, beep sound is
heard, however, unit does not start
operating.
1No operation for 2 minutes at most after the power
supply ON.
2Hand-held remote controller operation is prohibited.
• Remote controlling adaptor is connected to CN32
on the indoor controller circuit board.
• Hand-held remote controller operation is prohibited
by centralised controller etc. since it is connected to
MELANS.
3Factor of No.2 above.
1Normal operation.
2Normal operation.
3Check the details of No.2 above.
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.)
1Refrigerant shortage.
2Filter clogging.
3Heat exchanger clogging.
4Air duct short cycle.
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.
2Open suction grill 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.
4Remove the shield.
9. Defective fan of outdoor units.
(Not rotate)
1Check the winding resistance.
Refer to 13-6.
However, make sure to check the resis-
tance after it gets cold enough ([87i15:),
as there is a possibility that the tempera-
ture protector housed in the fan motor is
working.
2Check CN2, CN5, CN6, TAB-U, TAB-V,
TAB-W, TAB-W wiring.
3Replace outdoor fan controller circuit board.
1Defective fan motor (Winding open or shoot).
2Disconnection or loose connection of connector on
outdoor Fan controller circuit board.
3Defective Outdoor fan controller circuit board.
OC317-2.qxp 04.11.26 9:39 AM Page 42