HOW to Proceed SELF-DIAGNOSIS | Mitsubishi Electronics PUY-A30NHA2

10-3. HOW TO PROCEED "SELF-DIAGNOSIS"

10-3-1. 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.

1[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".)

2In the case of group control, for which 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.

3 To clear the error code, press the

ON/OFF button.

(Alternating Display)

Error code (2 or 4 digits)

Address (3 digits) or unit number (2 digits)

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

ON/OFF button.

10-3-2. 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.

1Switch 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

2Set the unit number or refrigerant address you want to diagnose.

FPress the [TEMP] buttons ( and ) to select the desired number or address. The number (address) changes between [01] and [50] or [00] and [15].

The refrigerant address will begin to blink approximately 3 seconds after being

selected and the self-diagnosis process will begin.

3Display 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.)

(Alternating Display)

Error code (2 or 4 digits) <When there is no error code history>

Address (3 digits) or unit number (2 digits) <When there is no corresponding unit>

4Reset the error history.

Display the error history in the diagnosis result display screen (see step 3).

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