Mitsubishi Electric Mr.SERVICE PUHZ-HRP71VHA Service Manual page 28

"TEST RUN" and the currently selected
operation mode are displayed altemately.
Displays the remaining
test run time.
Pipe (liquid) temperature
• 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 dis-
played 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 flash.
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 fin-
ishes, LED2 (red) will be turned off.)
In case OUTDOOR BOARD LED is digital display,
• 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
Remote Controller Display
Remote controller displays "PLEASE
WAIT", and cannot be operated.
After power is turned on, "PLEASE WAIT"
is displayed for 3 minutes, then error code
is displayed.
No display appears even when remote
controller operation switch is turned on.
(Operation lamp does not light up.)
Display appears but soon disappears
even when remote controller is operated.
w Press the remote controller's CHECK button twice to perform self-diagnosis. See the table below for the contents of LCD display.
Contents of inferior phenomena
LCD
Abnormality of room temperature thermistor
P1
Abnormality of pipe temperature thermistor/Liquid
P2
Abnormality of drain sensor/ Float switch connector open
P4
P5 Drain overflow protection is operating.
Freezing/overheating protection is operating.
P6
Abnormality of pipe temperature
P8
P9 Abnormality of pipe temperature thermistor/Cond./Eva
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 (microprocessor power supply)
LED2 (remote controller)
LED3 (indoor/outdoor communication)
Operating procedures
1. Turn on the main power supply.
2. Press
3. Press
button.
4. Press
5. Check the outdoor unit fan for
correct running.
[TEST] button
6. Press the ON/OFF button to reset the test run in progress.
7. Register the contact number.
OUTDOOR BOARD LED Display
< > indicates digital display.
After "startup" is displayed, only
green lights up. <00>
After "startup" is displayed,
green(once) and red(once) blink
alternately. <F1>
After "startup" is displayed,
green(once) and red(twice) blink
alternately. <F3, F5, F9>
After "startup" is displayed,
green(twice) and red(once) blink
alternately. <EA. Eb>
After "startup" is displayed, only
green lights up. <00>
After "startup" is displayed, only
green lights up. <00>
Lits when power is supplied.
Lits when power is supplied for wired remote controller.
The indoor unit should be connected to the outdoor unit with address "0" setting.
Blinks when indoor and outdoor unit are communicating.
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.
"PLEASE WAIT" appears for about 2 minutes after power
supply is turned on. 1
TEST button twice.
The TEST RUN appears on the screen.
Cooling mode: Check if cool air blows and water is drained.
OPERATION SWITCH
Heating mode: Check if warm air blows. (It takes a little
AIR DIRECTION button.
Check for correct motion of auto-vanes.
The outdoor unit features automatic capacity control to
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.
— and — will be displayed alternately every second.
• After power is turned on, "PLEASE WAIT" is displayed for 2
minutes during system startup. (Normal)
• Incorrect connection of outdoor terminal block (L
S1, S2, S3.)
• Outdoor unit's protection device connector is open.
• Incorrect wiring between the indoor and outdoor unit (Polarity
is wrong for S1, S2, S3.)
• Remote controller transmission wire is short.
• There is no outdoor unit of address 0.
(Address is other than 0.)
• Remote controller transmission wire is open.
• After canceling function selection, operation is not possible for
about 30 seconds. (Normal)
Contents of inferior phenomena
LCD
Malfunction outdoor unit
U1~UP
Malfunction outdoor unit
F3~F9
E0~E5 Remote controller transmitting error
Indoor/outdoor unit communication error
E6~EF
---- No error history
No applied unit
FFFF
PA Forced compressor stop(due to water leakage abnormality)
28
while until warm air blows.)
Cause
, L , L
1 2 3
and