Mitsubishi Electronics PUY-A42NHA2-BS Operating procedures, Contents of inferior phenomena

"TEST RUN" and the currently selected operation mode are displayed altemately.

Displays the remaining test run time.

59 °F

B

C

A[TEST] button

Pipe (liquid) temperature

Operating procedures	While the room temperature display on the remote
	controller is “PLEASE WAIT”, the remote controller is disabled.
	Wait until “PLEASE WAIT” disappears before using remote controller.

1.Turn on the main power supply. “PLEASE WAIT” appears for about 2 minutes after power supply is turned on. w1

2.Press A TEST button twice. The TEST RUN appears on the screen.

3. Press B OPERATION SWITCH	Cooling mode: Check if cool air blows and water is drained.
	Heating mode: Check if warm air blows. (It takes a little
button.
	while until warm air blows.)

4.PressC AIR DIRECTION button. Check for correct motion of auto-vanes.

5. Check the outdoor unit fan for	The outdoor unit features automatic capacity control to
correct running.	provide optimum fan speeds. Therefore, the fan keeps
	running at a low speed to meet the current outside air
	condition unless it exceeds its available maximum power.
	Then, in actuality, the fan may stop or run in the reverse
	direction depending on the outside air, but this does not
	mean malfunction.

6.Press the ON/OFF button to reset the test run in progress.

7.Register the contact number.

•In case of test run, the OFF timer will be activated, and the test run will automatically stop after 2 hours.

•The room temperature display section shows the pipe temperature of indoor units during the test run.

•Check that all the indoor units are running properly in case of simultaneous twin operation. Malfunctions may not be displayed regardless of incorrect wiring.

w1 After turning on the power supply, the system will go into startup mode, “PLEASE WAIT” will blink on the display section of the room temperature, and lamp(green) of the remote controller will blink.

As to INDOOR BOARD LED, LED1 will be lit up, LED2 will either be lit up in case the address is 0 or turned off in case the address is not 0. LED3 will blink.

As to OUTDOOR BOARD LED, LED1(green) and LED2(red) will be lit up. (After the startup mode of the system finishes, LED2(red) will be turned off.)

In case OUTDOOR BOARD LED is digital display, — and — will be displayed alternately every second.

•If one of the above operations doesn’t function correctly, the causes written below should be considered. Find causes from the symptoms.

The below symptoms are under test run mode. “startup” in the table means the display status of w1 written above.

Symptoms in test run mode		Cause
Remote Controller Display	OUTDOOR BOARD LED Display
	< > indicates digital display.
Remote controller displays “PLEASE	After “startup” is displayed, only	• After power is turned on, “PLEASE WAIT” is displayed for 2
WAIT”, and cannot be operated.	green lights up. <00>	minutes during system startup. (Normal)
	After “startup” is displayed,	• Incorrect connection of outdoor terminal block (L1, L2, and
	green (once) and red (once)
After power is turned on, “PLEASE WAIT”		S1, S2, S3.)
	blink alternately. <F1>
is displayed for 3 minutes, then error code
	After “startup” is displayed,
is displayed.	green (once) and red (twice)	• Outdoor unit’s protection device connector is open.
	blink alternately. <F3, F5, F9>
	After “startup” is displayed,	• Incorrect wiring between the indoor and outdoor unit (Polarity
No display appears even when remote	green (twice) and red (once)	is wrong for S1, S2, S3.)
	blink alternately. <EA. Eb>	• Remote controller transmission wire is short.
controller operation switch is turned on.
	After “startup” is displayed, only	• There is no outdoor unit of address 0.
(Operation lamp does not light up.)
	green lights up. <00>	(Address is other than 0.)
		• Remote controller transmission wire is open.
Display appears but soon disappears	After “startup” is displayed, only	• After canceling function selection, operation is not possible for
even when remote controller is operated.	green lights up. <00>	about 30 seconds. (Normal)

w Press the remote controller’s CHECK button twice to perform self-diagnosis. See the table below for the contents of LCD display.

LCD	Contents of inferior phenomena	LCD		Contents of inferior phenomena
P1	Abnormality of room temperature thermistor	U1~UP	Malfunction outdoor unit
P2	Abnormality of pipe temperature thermistor/Liquid	F3~F9	Malfunction outdoor unit
P4	Abnormality of drain sensor/Float switch connector open	E0~E5	Remote controller transmitting error
P5	Drain overflow protection is working.	E6~EF	Indoor/outdoor unit communication error
P6	Freezing/overheating protection is working.	----	No	error history
P8	Abnormality of pipe temperature	FFFF	No applied unit
P9	Abnormality of pipe temperature thermistor/Cond./Eva	PA	Forced compressor stop(due to water leakage abnormality)
Fb	Abnormality of indoor controller board

See the table below for details of the LED display (LED 1, 2, 3) on the indoor controller board.

LED1 (microcomputer power supply)	Lits when power is supplied.
LED2 (remote controller)	Lits when power is supplied for wired remote controller.
	The indoor unit should be connected to the outdoor unit with address “0” setting.
LED3 (indoor/outdoor communication)	Blinks when indoor and outdoor unit are communicating.

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