Mitsubishi Electric PU-P71VHA 2.UK Series Service Manual page 41

11-3-3. Wh en a Problem Occurs During Operation
If a problem occurs in the air conditioner, the indoor and outdoor units will stop,
and the problem is shown in the remote controller display.
[CHECK] and the refrigerant address are displayed on the temperature
display, and the check code and unit number are displayed alternately as
shown below.
1 If the outdoor unit is malfunctioning, the unit number will be "00".
2 In the case of group control, for which one remote controller controls
multiple refrigerant systems, the refrigerant address and check code of the
unit that first ex perienced trouble (i.e., the unit that transmitted the check
code) will be displayed.
3 To clear the check code, press the
When using remote-/ local-controller combined operation, cancel the check code after turning off remote operation. During
central control by a MELANS controller, cancel the check code by pressing the
11-3-4. Self-Diagnosis During Maintenance or Serv ice
Since each unit has a function that stores check codes, the latest check code can be recalled even if it is cancelled by the remote
controller or power is shut off.
Check the check code history for each unit using the remote controller.
1
Switch to self-diagnosis mode.
H
Press the button twice within 3 seconds. The display content
CHECK
will change as shown below.
Unit number or refrigerant address
to be diagnosed
3
Display self-diagnosis results.
<When there is check code history>
(For the definition of each check code, refer to the indoor unit' s installation manual or service handbook.)
<When there is no check code history>
4
Reset the check code history.
Display the check code history in the diagnosis result display screen (see step
OC37 9 J
button.
ON / OFF
(Alternating Display)
check code (2 or 4 digits)
(Alternating Display)
check code (2 or 4 digits)
3
).
F
E
G
Address (3 digits) or unit number (2 digits)
ON / OFF
2
Set the unit number or refrigerant address you want to diagnose.
F
Press the [TEMP] buttons (
or address. The number (address) changes between [01] and [50] or [00]
and [15].
The refrigerant address will begin to flash
approx imately 3 seconds after being
selected and the self-diagnosis process will begin.
Address (3 digits) or unit number (2 digits)
<When there is no corresponding unit>
41
C D
button.
and ) to select the desired number
I
A
B
H