Mitsubishi MS-18RV Service Manual download pdf (Page 57)

Check of outdoor thermistor

Measure

resistance

between CN 662

3 and 4.

Yes

Replace the

thermistor.

Measure

resistance

between CN 662

1 and 2.

Connect CN662.

Turn ON the power

supply and press

the EMERGENCY

OPERATION

switch.

Does the resistance

of thermistor have the

characteristics on

page 60?

Yes

Does the unit operate

10 minutes or more?

Replace the deicer P.C.

board.

Ok W1.

W1. It is thought defective contact of the connector.

Turn OFF the

power supply.

Discharge temperature

thermistor(RT62)

Ambient temperature

thermistor(RT63)

Thermistors in the outdoor unit are abnormal.

w Disconnect the connectors CN662 from the deicer P.C. board. (Check the characteristics of each thermistor.)

Check of LEV (Expansion valve)

With remote controller set toward the indoor unit, press

OPERATE/ STOP(ON/ OFF) button and confirm one

beep tone.

LEV operates in full-opening

direction.

Is LEV coil properly fixed to

the body?

Cooling does not operate.

Do you hear LEV "click,

click·······"?

Do you touch LEV and feel

it vibrate?

Does the resistance of thermistor

have the characteristics?

Yes

LEV (CN724)

WHT–RED

RED–ORN

YLW–BRN

BRN–BLU

Resistance

30.3 " ~ 37.0 "

Characteristics of LEV coil

Properly fix LEV coil to

the body.

Replace the

DEICER P.C. board.

NOTE : After check of LEV, do the undermentioned operations.

1. Turn OFF the power supply of the unit and turn ON again.

2. Press the RESET button on the remote controller.

Replace the

LEV coil.

1 During pressing OPERATION SELECT button

on remote controller, press RESET button.

2 First, release RESET button.

(Confirm all displays of remote controller.)

3 Then release OPERATION SELECT button.

1 During pressing OPERATION SELECT

button on remote controller, press

RESET button.

2 First, release RESET button.

(Confirm all displays of remote controller.)

3 Then release OPERATION SELECT button.

AMPM

CLOCK

˚C

AMPM

<MS-30RV only>

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Mitsubishi MS-18RV Service Manual Page 57

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