Mitsubishi Electric PUHZ-SHW80VHA Service Manual page 29

1 0 - 3- 3. S elf- diagnosis < P A R - 2 1 M A A >
9 - 3- 1 . W h en a P rob lem O c c urs D uring O p eration
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.
1 [CHECK] and the refrigerant address are displayed on the
temperature display, and the check code and unit number are
displayed alternately as shown below. (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
1 0 - 3- 4 . S elf- diagnosis during maintenanc e or serv ic e < P A R - 2 1 M A A >
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 turned off.
Check the error history for each unit using the remote controller.
1
Switch to self-diagnosis mode.
H
Press the CHECK button twice within 3 seconds. The display content
will change as shown below.
Unit number or refrigerant address
to be diagnosed
3
Display self-diagnosis results.
<When there is error history>
(For the definition of each check code, refer to the indoor unit' s installation manual or service handbook.)
<When there is no error history>
4
Reset the error history.
Display the error history in the diagnosis result display screen (see step
OCH526C
ON / OFF button.
(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 blink
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>
C D
button.
and ) to select the desired number
I
A
B
H