Mitsubishi Electric MXZ-5C100VA Service Manual download pdf (Page 79)

MXZ-6C

Upper or

left lamp of

OPERATION

INDICATOR

lamp (Indoor

unit)

Abnormal point

(Failure mode/protection)

LED indication

(Outdoor P.C. board)

Condition Remedy

Indoor/

outdoor

unit failure

mode

recall

function

LED 1 LED 2

OFF None (Normal) Lighting Lighting

2-time ﬂ ash Outdoor power system Lighting Lighting Overcurrent protection cut-out operates

3 consecutive times, bus-bar voltage

protection cut-out operates 3 consecu-

tive times, or primary current protection

cut-out operates 3 consecutive times

within 1minute after the compressor

gets started.

• Check the connection of

the compressor connecting

wire.

• Refer to 11-6.

How to

check inverter/compressor.

• Check the stop valve.

○

3-time ﬂ ash Discharge temperature thermis-

tor

Lighting Once Thermistor shorts or opens during

compressor running.

• Refer to 11-6. "Check of

outdoor thermistors".

○

Defrost thermistor Lighting Once

Ambient temperature thermistor Lighting Twice

Fin temperature thermistor Lighting 3 times • Replace the power board.

P.C. board temperature thermis-

tor

Lighting 4 times • Replace the power board.

Outdoor heat exchanger tem-

perature thermistor

Lighting 9 times • Refer to 11-6. "Check of

outdoor thermistors".

4-time ﬂ ash Overcurrent Once Goes out 40 A current ﬂ ows into intelligent power

module.

• Reconnect compressor con-

nector.

• Refer to 11-6.

"How to

check inverter/compressor".

• Check the stop valve.

—

Out-of-step protection 9 times Goes out Waveform of compressor current is dis-

torted.

• Refer to 11-6.

" How to

check inverter/compressor.

5-time ﬂ ash Discharge temperature Lighting Lighting Discharge temperature exceeds 114 °C

during operation.

Compressor can restart if discharge

temperature thermistor reads 100 °C or

less 3 minutes later.

• Check refrigerant circuit and

refrigerant amount.

• Refer to 11-6. "Check of

LEV".

—

6-time ﬂ ash High pressure Lighting Lighting High-pressure is detected with the

high-pressure switch (HPS) during op-

eration.

• Check refrigerant circuit and

refrigerant amount.

• Check the stop valve.

—

The outdoor heat exchanger tempera-

ture exceeds 70 °C during cooling or

the indoor gas pipe temperature ex-

ceeds 70°C during heating.

7-time ﬂ ash Fin temperature 3 times Goes out

The ﬁ n temperature exceeds

110 °C /

105 °C during operation.

• Check around outdoor unit.

• Check outdoor unit air pas-

sage.

• Refer to 11-6.

"Check of

outdoor fan motor".

—

P.C. board temperature 4 times Goes out The P.C. board temperature exceeds

95 °C during operation.

8-time ﬂ ash Outdoor fan motor Lighting Lighting The fan motor speed is 50 rpm or less

or 1500 rpm or more for 1 minute, or

the fan motor speed is 100 rpm or

less for 15 seconds when the outside

temperature is 20 °C or more.

• Refer to 11-6.

"Check of

outdoor fan motor".

—

9-time ﬂ ash Nonvolatile memory data Lighting 5 times Nonvolatile memory data cannot be

read properly.

• Replace the outdoor control

P.C. board.

• Replace the power board.

○

10-time ﬂ ash Discharge temperature Lighting Lighting The frequency of the compressor is

kept 58Hz or more and the discharge

temperature is kept under 50 °C (cool-

ing)/40 °C (heating) for more than 40

minutes.

• Check refrigerant circuit and

refrigerant amount.

• Refer to 11-6. "Check of

LEV".

—

OBH584B

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Mitsubishi Electric MXZ-5C100VA Service Manual Page 79

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