Mitsubishi Electronics PUY-A36NHA2, PUZ-A42NHA2-BS, PUZ-A30NHA2, PUZ-A18NHA2-BS, PUZ-A36NHA2 Melans

Phenomena	Factor	Countermeasure
4. Even controlling by the wireless	1The pair number settings of the wireless remote	1Check the pair number settings.
remote controller no beep is heard	controller and indoor controller board are mis-
and the unit does not start operat-	matched.
ing. Operation display is indicated
on wireless remote controller.
5. When operating by the wireless	1No operation for 2 minutes at most after the power	1Normal operation
remote controller, beep sound is	supply ON.
heard, however, unit does not start	2Hand-held remote controller operation is prohibited.	2Normal operation
operating.	• Remote controlling adaptor is connected to CN32
	on the indoor controller board.
	• Hand-held remote controller operation is prohibited
	by centralised controller etc. since it is connected to
	MELANS.
	3Refer to factor of phenomena No.2 on previous page.	3Check the details of phenomena No.2 on
		previous page.
6. Remote controller display works	1Refrigerant shortage	1 If refrigerant leaks, discharging tempera
normally and the unit performs		ture rises and LEV opening increases.
cooling operation, however, the		Inspect leakage by checking the temper-
capacity cannot be fully obtained.		ature and opening.
(The air does not cool well.)		Check pipe connections for gas leakage.
	2Filter clogging	2 Open intake grille and check the filter.
		Clean the filter by removing dirt or dust
		on it.
	3Heat exchanger clogging	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.
	4Air duct short cycle	4 Remove the shield.
7. Remote controller display works nor-	1Linear expansion valve fault	1 Discharging temperature and indoor heat
mally and the unit performs heating	Opening cannot be adjusted well due to linear expan-	exchanger temperature does not rise.
operation, however, the capacity	sion valve fault.	Inspect the failure by checking discharg
cannot be fully obtained.		ing pressure.
		Replace linear expansion valve.
		2 If refrigerant leaks, discharging tempera-
	2Refrigerant shortage	ture rises and LEV opening increases.
		Inspect leakage by checking the tem per-
		ature and opening.
		Check pipe connections for gas leakage.
		3 Check the insulation.
	3Lack of insulation for refrigerant piping	4 Open intake grill and check the filter.
	4Filter clogging	Clean the filter by removing dirt or dust
		on it.
		5 If the filter is clogged, indoor pipe tem
	5Heat exchanger clogging	perature rises and discharging pressure
		increases. Check if heat exchanger is
		clogged by inspecting discharging pres-
		sure.
		Clean the heat exchanger.
		6 Remove the shield.
	6Air duct short cycle	7 Check refrigerant system during opera-
	7Bypass circuit of outdoor unit fault	tion.
8. 1For 3 minutes after temperature	12Normal operation	12Normal operation
adjuster turns off, the compressor	(For protection of 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.)

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