How To Proceed "Self-Diagnosis"; When A Problem Occurs During Operation; Self-Diagnosis During Maintenance Or Service - Mitsubishi Electric Mr.SLIM PU-P71VHA Service Manual

11-3. HOW TO PROCEED "SELF-DIAGNOSIS"

11-3-1. When 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 error code and unit number are displayed alternately as
shown below.
If the outdoor unit is malfunctioning, the unit number will be "00".
In the case of group control, for which one remote controller controls
multiple refrigerant systems, the refrigerant address and error code of the
unit that first experienced trouble (i.e., the unit that transmitted the error
code) will be displayed.
To clear the error code, press the
When using remote-/local-controller combined operation, cancel the error code after turning off remote operation. During
central control by a MELANS controller, cancel the error code by pressing the

11-3-2. Self-Diagnosis During Maintenance or Service

Since each unit has a function that stores error codes, the latest check code can be recalled even if it is cancelled by the remote
controller or power is shut off.
Check the error code history for each unit using the remote controller.
Switch to self-diagnosis mode.
Press the CHECK button twice within 3 seconds. The display content
will change as shown below.
Unit number or refrigerant address
to be diagnosed
Display self-diagnosis results.
<When there is error code history>
(For the definition of each error code, refer to the indoor unit's installation manual or service handbook.)
<When there is no error code history>
Reset the error history.
Display the error history in the diagnosis result display screen (see step
OC379F
button.
ON/OFF
(Alternating Display)
Error code (2 or 4 digits)
(Alternating Display)
Error code (2 or 4 digits)
).
Address (3 digits) or unit number (2 digits)
ON/OFF
Set the unit number or refrigerant address you want to diagnose.
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
approximately 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>
33
button.
and ) to select the desired number