Mitsubishi Electric MSZ-HJ35VA-E1 Service Manual download pdf (Page 38)

M How to check miswiring and serial signal error

1 Make sure that the wiring is correct. If the pro-

cedure is performed without correcting miswir-

ing, it may lead to damage to the P.C. board.

Reinstall ei-

ther the unit

or the light

away from

each other.

Attach a ﬁ lter

on remote

control

receiving

section of

the indoor

unit.

•

Turn OFF inverter-controlled lighting

equipment.

Turn OFF the power supply and then

turn ON again.

Press the emergency operation switch.

•

After the relay

52C is turned on

3 minutes later, is

miswiring or the

serial signal error

indicated?

Yes

Be sure to release the failure-mode recall function after checking.

Turn OFF the power supply.

Is there rated voltage in the

power supply?

Yes

1. Turn ON the power supply.

2. Press the emergency operation switch.

Check the power supply.

Has the relay 52C been turned on 3 minuets later ?

[The relay will be turned on in 3 to 7 seconds by short

circuiting the timer short mode point (Refer to 10-7.).]

Is there any miswiring, poor

contact, or wire disconnec-

tion of the indoor/outdoor

connecting wire?

Yes

Correct them.

Yes

Aim the remote controller at the indoor unit, and press

OPERATE/STOP (ON/OFF) button. The relay 52C will

be turned on, and the outdoor unit will be energized.

Is the rated supply voltage applied

between the S1 and S2 on the

outdoor terminal block? (Check of

supply voltage)

Is there any problem in the

indoor/outdoor connecting wire,

such as the damage of the wire,

intermediate connection, poor

contact with the terminal block?

Yes

Replace

the indoor/

outdoor con-

necting wire.

Replace the indoor electronic control

P.C. board.

Is there approximately 250 VDC – 370

VDC between DB61 (+) and DB61

(–) on the inverter P.C. board in the

outdoor unit? (Voltage check of the

inverter P.C. board in the outdoor unit)

Replace the

inverter P.C.

board in the

outdoor unit. 2

Yes

Does the LED on the inverter P.C.

board in the outdoor unit repeat

"3.6-second-OFF and 0.8-second-

ON quick blinking" for 3 minutes

after the outdoor unit is energized?

(Check the blinking pattern within 3

minutes after LED is turned on. Af-

ter 3 minutes, LED will blink 6 times

whether the inverter P.C. board in

the outdoor unit is normal or not.)

Replace the

inverter P.C.

board in the

outdoor unit. 2

Yes

Be careful of 140

VDC – 280 VDC

residual charge in

the capacitor on the

main inverter circuit.

Turn OFF the power supply. Make sure again that the

indoor/outdoor connecting wire is correctly connected. With

the indoor/outdoor connecting wire connected, short circuit

between S2 and S3 on the outdoor terminal block. 1

While pressing both OPERATION SELECT button and

TOO COOL button on the remote controller at the same

time, press RESET button.

First, release RESET button.

Hold down the other two buttons for another 3 seconds.

Make sure that the indicators on the LCD screen shown in

the right ﬁ gure are all displayed. Then release the buttons.

(Setting up the failure mode recall function)

Indication of miswiring

Indication of serial signal error

OPERATION

INDICATOR lamp

Continuous blinks

Initializing the determination of the power

receiving system

The microprocessor may have mistaken the

unit as a model receiving power from the

outdoor unit. Follow the procedure below to

start the determination of the power receiv-

ing system all over again.

1. Hold down the emergency operation

switch for 30 seconds. (Do not release the

switch even though a buzzer beeps once

in about 5 seconds. Keep holding down

the switch until a buzzer beeps again for

1 second after 30 seconds. Figure 1)

2. Turn off the power supply.

3. Wait for about 30 seconds.

4. Turn on the power supply.

5. Press the emergency operation switch.

6. The relay 52C will be turned on in 3 min-

utes.

Has the miswiring or the serial error

been indicated?

Yes

OFF

Buzzer

0.5-second 1-second

OFF

Emergency

operation switch

30-second

ON OFF

5-second

Beeps BeepsBeeps

Figure 1

OBH648A

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 47 48

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Mitsubishi Electric MSZ-HJ35VA-E1 Service Manual Page 38

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