Mitsubishi PLA-RP Manuel de service télécharger pdf (Page 64)

10-2. SELF-DIAGNOSIS ACTION TABLE

Note: Refer to the manual of outdoor unit for the details of display

such as F, U, and other E.

Error Code

Meaning of error code and detection method

Case

Judgment and action

Abnormality of room temperature

thermistor (TH1)

1 The unit is in three-minute resume

prevention mode if short/open of

thermistor is detected. Abnormal if the

unit does not reset normally after three

minutes. (The unit returns to normal

operation, if it has normally reset.)

2 Constantly detected during cooling,

drying, and heating operation.

Short: 90: or more

Open: -40: or less

1 Defective thermistor

characteristics.

2 Contact failure of connector

(CN20) on the indoor controller

board. (Insert failure)

3 Breaking of wire or contact

failure of thermistor wiring.

4 Defective indoor controller

board.

1–3 Check resistance value of thermistor.

0: ······15.0k"

10: ····9.6k"

20: ····6.3k"

30: ····4.3k"

40: ····3.0k"

If you put force on (draw or bend) the lead wire

with measuring resistance value of thermistor

breaking of wire or contact failure can be

detected.

2 Check contact failure of connector (CN20) on

the indoor controller board. Refer to 10-6-2.

Put the power on again and check restart

after inserting connector again.

4 Check room temperature display on remote

controller.

Replace indoor controller board if there is

abnormal difference with actual room

temperature.

There is no abnormality if none of above

comes within the unit.

Put the power off, and on again to operate.

Abnormality of pipe temperature

thermistor/Liquid (TH2)

1 The unit is in three-minute resume

prevention mode if short/open of

thermistor is detected. Abnormal if the

unit does not reset normally after three

minutes. (The unit returns to normal

operation, if it has normally reset.)

2 Constantly detected during cooling,

drying, and heating (except defrosting)

operation.

Short: 90: or more

Open: -40: or less

1 Defective thermistor

characteristics.

2 Contact failure of connector

(CN21) on the indoor controller

board. (Insert failure)

3 Breaking of wire or contact

failure of thermistor wiring.

4 Defective refrigerant circuit is

causing thermistor temperature

of 90: or more or -40: or

less.

5 Defective indoor controller board.

1–3 Check resistance value of thermistor.

For characteristics, refer to (P1) above.

2 Check contact failure of connector (CN21) on

the indoor controller board. Refer to 10-6-2.

Put the power on and check restart after

inserting connector again.

4 Check pipe <liquid> temperature with remote

controller in test run mode. If pipe <liquid>

temperature is exclusively low (in cooling

mode) or high (in heating mode), refrigerant

circuit may have defective.

5 Check pipe <liquid> temperature with remote

controller in test run mode. If there is exclusive

difference with actual pipe <liquid> temperature,

replace indoor controller board. There is no

abnormality if none of above comes within the

unit.

Put the power off, and on again to operate.

Abnormality of drain sensor (DS)

1 Suspensive abnormality, if short/open of

thermistor is detected for 30 seconds

continuously.

Put off compressor and indoor fan.

2 Short/open is detected for 30 seconds

continuously during suspensive

abnormality.

(The unit returns to normal operation,

if it has normally reset.)

3 Detect the following condition.

• During cooling and drying operation.

• In case that pipe <liquid> temperature

- room temperature <-10deg

(Except defrosting)

• When pipe <liquid> temperature or

room temperature is short/open

temperature.

• During drain pomp operation.

1 Defective thermistor

characteristics

2 Contact failure of connector

(CN31) on the indoor controller

board. (Insert failure).

3 Breaking of wire or contact

failure of drain sensor wiring.

4 Defective indoor controller board.

1–3 Check resistance value of thermistor.

0: ······6.0k"

10: ····3.9k"

20: ····2.6k"

30: ····1.8k"

40: ····1.3k"

2 Check contact failure of connector (CN31) on

the indoor controller board. Refer to 10-6-2.

Put the power on again and check restart

after inserting connector again.

4 Replace indoor controller board if drain

pump operates with the line of drain sensor

connector CN31-1 and 2 is short-circuited,

and abnormality reappears.

There is no abnormality if none of above

comes within the unit. Put the power off, and

on again to operate.

Malfunction of drain pump (DP)

1 Suspensive abnormality, if thermistor of

drain sensor is let heat itself and tem-

perature rises slightly. Put off compres-

sor and indoor fan.

2 Drain pomp is abnormal if the condition

above is detected during suspensive

abnormality.

3 Constantly detected during drain pomp

operation.

1 Malfunction of drain pump

2 Defective drain

Clogged drain pump

Clogged drain pipe

3 Attached drop of water at the

drain sensor

• Drops of drain trickles from

lead wire.

• Clogged filter is causing

wave of drain.

4 Defective indoor controller board.

1 Check if drain-up machine works.

2 Check drain function.

3 Check the setting of lead wire of drain sensor

and check clogs of the filter.

4 Replace indoor controller board if drain

pump operates with the line of drain sensor

connector CN31-1 and 2 is short-circuited

and abnormality reappears.

Refer to 10-6-2.

There is no abnormality if none of above

comes within the unit. Put the power off, and

on again to operate.

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Mitsubishi PLA-RP Manuel de service Page 64

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