Mitsubishi Heavy Industries FDC508HES3 Owner's Manual download pdf (Page 25)

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YES YES

Are the heat

exchanger thermistor

characteristics OK, is

there no short

circuit?

YES

Is the indoor

unit heat exchanger

thermistor connector

connection OK?

YES

Is the air filter

clogged?

Correction

Washing

Adjustment

Is the heating

under overload?

Defective indoor unit PCB

Replacement (Defective indoor unit heat

exchanger thermistor input circuit)

Defective heat exchanger

thermistor Replacement

(1)

Heating overload

Note (1) To see whether or not it is over-

loaded, check the following:

uIs the inside/outside air tem-

perature too high?

uIs there any short circuit?

uIs the refrigerant excessive?

Indoor unit

Check Lamp (yellow) 6 time flashes

Abnormality casued by insufficient refrigerant.

Indoor unit

Check Lamp (yellow) 5 time flashes

YES

Is the

amount of refrigerant

circulation good? (If refrige-

rant is insufficient, the ca-

pillary tubes may be

plugged.)

Printed circuit board for indoor

unit no good replace.

Charge with refrigerant.

Replace capillary tubes.

YES

Are the

characteristic values for

the heat exchanger

thermistor OK?

Replace heat exchanger thermistor.

Note (1) Refer to previous page for heat exchanger thermistor tempera-

ture resistance characteristic values.

YES YES

YES

Does the

voltage oscillate

between DC6 and 10V

between control switch

circuit board connector

(CnB) Y (White)

to Z (Black)?

Does the

voltage oscillate

between DC6 and

10V between indoor unit

PCB connector (CNB)

2 (White) to 3

(Black)?

YES

Is there

DC 10.8V

between control

switch circuit board con-

nector (CnB) X

(Red) to Z

(Black)?

Is there

DC 10.8V

between indoor unit

PCB connector (CNB)

1 (Red) to 3

(Black)?

YES

Defective indoor

unit PCB

Power

supply

reset

Is it

normalized?

Unit is normal

(Intrusion of accidental

noise on the control switch

cord)

Defective control

switch PCB

(1)

The control switch wiring

(white) or (black) is broken or

have a defective connection.

Defective control switch

PCB Replacement

Defective indoor unit PCB

Replacement

The control switch wiring (red)

or (black) is broken or have a

defective connection.

Error display :

e 1

[Communication error between control switch ~ Indoor unit PCB]

Note (1) If it is normalized by changing PCB, judge the control switch or indoor

unit PCB (Communication error between control switch and unit) is

detective.

• Normal voltage for control switch wiring (DC)

Between X and Z : 10.5 ~ 10.8 V

Between Y and Z : 5 ~ 10.8 V

(ii) Only case of wired remote control model

1 2 ... 20 21 22 23 24 25 26 27 28 29 30 ... 33 34

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Mitsubishi Heavy Industries FDC508HES3 Owner's Manual Page 25

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