Mitsubishi MSZ-HC35VA Service Manual download pdf (Page 36)

Replace the indoor power P.C. board

and the indoor terminal P.C. board

K How to check miswiring and serial signal error

Turn OFF the power supply.

Is there rated voltage in the

power supply?

Yes

Turn ON the power supply.

Check the power supply.

Is there rated voltage between

outdoor terminal block S1 and

S2?

Check the wiring.

Press EMERGENCY OPERATION switch once.

Does the upper lamp of OPERATION INDICA-

TOR lamp light up? <Conﬁ rmation of the power

to the indoor unit>

Yes

Is serial signal error indicated 6 minutes later?

Yes

Is there any miswiring,

poor contact, or wire

disconnection of the

indoor/outdoor connect-

ing wire?

Yes

Correct them.

Turn OFF the power supply.

Check once more if the indoor/outdoor

connecting wire is not miswiring.

Short-circuit outdoor terminal block S2

and S3.

1. Miswiring may damage indoor P.C. board during the

operation.

Be sure to conﬁ rm the wiring is correct before the opera-

tion starts.

Turn ON the power supply.

Does the LED on the inverter P.C. board or

the outdoor electronic control P.C. board

repeat "3.6-second-OFF and 0.8-second-

ON quick blinking"? 3

Yes

(Lighted

or not

lighted)

Replace the inverter P.C. board or the

outdoor electronic control P.C. board.

2. Be careful to the residual

voltage of smoothing capacitor.

Turn OFF the power supply.

Remove the short-circuit between out-

door terminal block S2 and S3.

Turn ON the power supply.

Is there amplitude of 10 to 20 VDC

between indoor terminal block S2 and

S3? <Conﬁ rmation of serial signal>

Is there rated voltage between indoor

terminal block S1 and S2?

<Conﬁ rmation of power voltage>

Yes

Is there any error of the in-

door/outdoor connecting wire,

such as the damage of the wire,

intermediate connection, poor

contact to the terminal block?

Yes

Replace the

indoor/outdoor

connecting wire.

Is there 2 VDC or less between CN10A (+)

and JPG (GND)(-) on the indoor electronic

control P.C. board?

Yes

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

Yes

Turn OFF inverter-controlled lighting

equipment.

Turn OFF the power supply and then

turn ON again.

Press EMERGENCY OPERATION

switch.

•

Is serial signal

error indicated 6

minutes later?

Yes

Reinstall

either the unit

or the light

each other

away.

Attach a ﬁ lter

on remote

control receiv-

ing section

of the indoor

unit.

•

3. Be sure to check this within 3 minutes after turning ON.

After 3 minutes, LED blinks 6 times. Even when the

inverter P.C. board or the outdoor electronic control P.C.

board is normal, LED blinks 6 times after 3 minutes.

Is there 2 VDC or less between

CN10A (+) and JPG (GND)(-) on

the indoor electronic control P.C.

board?

Is there 2 VDC or less between

CN10A (+) and JPG (GND)(-) on

the indoor electronic control P.C.

board?

Replace the indoor elec-

tronic control P.C. board.

No Yes No

Yes

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 42 43 44

Comments to this Manuals

No comments

Mitsubishi MSZ-HC35VA Service Manual Page 36

Comments to this Manuals

Related products and manuals for Split-system air conditioners Mitsubishi MSZ-HC35VA