Mitsubishi Electric MXZ-A18WV, Руководство по обслуживанию

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MXZ-A26WV - MXZ-A32WV -
E1 E1
Indication
Abnormal point Detecting method
Symptom: Outdoor unit does not operate.
Check points
LED 1
(Red)
Lighting Twice Outdoor power system
When the compressor operation has been interrupted by over current
protection continuously three times within 1 minute after start-up, or
when power factor control module protection or DC control protection is
activated three times within 3 minutes after the compressor get started.
• Check the inverter/compressor.
• Replace the outdoor electronic control
P.C. board.
• Check the abnormality indication on the
indoor unit.
• Check the LEV.
Lighting 7 times Outdoor control system
Lighting Once Indoor unit and LEV
When the nonvolatile memory data cannot be read properly on the
outdoor electronic control P.C. board.
When the drain abnormality is detected in the indoor unit and the indoor
unit coil temperature is too low, or when any abnormality is detected in
the components of indoor unit.
LED 2
(Yellow)
LED 1 (Red)
Lighting
LED 2 (Yellow)
Lighting
Error mode
Normal
Indication
Abnormal point Detecting method
Symptom: It is repeated that outdoor unit stops and restarts 3 minutes later.
Check points
LED 1
(Red)
Lighting
Outdoor heat exchanger
temperature thermistor When outdoor heat exchanger temperature thermistor is short or open
while compressor is operating.
• Replace the outdoor electronic control
P.C. board.
• Check the amount of gas and the
refrigerant cycle.
• Check the outdoor unit air passage.
• Check the characteristic of the discharge
temperature thermistor.
• Check the connector. (CN661)
Lighting 3 times
Discharge temperature
thermistor When a short or open circuit occurs in the discharge temperature
thermistor during compressor operating.
Twice Goes out Overcurrent protection When overcurrent is applied to the power module.
3 times Goes out
Discharge temperature
overheat protection When the discharge temperature thermistor detects 116 : or above.
(Protection will be released at 100
:
or below.)
4 times Goes out
Fin temperature
overheat protection
When the fin temperature thermistor detects 87 : or above.
• Check the characteristic of the evaporation
temperature thermistor.
• Check the connector. (CN661)
• Check the characteristic of the high
pressure protect thermistor.
• Check the connector. (CN661)
Lighting 5 times
5 times
Lighting Current sensor
When the output from compressor current sensor becomes 25A or
more while the compressor is operating. • Check if the connection lead wires of com-
pressor are correctly connected.
6 times
Evaporation temperature
thermistor
When a short or open circuit occurs in the evaporation temperature
thermistor during compressor operating.
• Check if the connection wires between
outdoor electronic control P.C. board and
power board are correctly connected.
Lighting 11 times
Communication error
between P.C. boards When the communication failure between the outdoor electronic control
P.C. board and power board occurs twice consecutively.
• Check if the connection wires between
noise filter P.C. board and power board are
correctly connected.
Lighting 12 times Zero cross signal error
When zero cross signal cannot be detected while the compressor is
operating.
• Check the characteristic of the gas pipe
temperature A thermistor.
• Check the connector. (CN662)
Lighting 10 times
Gas pipe temperature A
thermistor
When a short or open circuit occurs in the gas pipe temperature A
thermistor during compressor operating.
• Check the characteristic of the gas pipe
temperature B thermistor.
• Check the connector. (CN662)
• Check the outdoor unit air passage.
• Check the outdoor fan motor.
• Check the power module.
• Check the inverter/compressor.
• Check the amount of gas.
• Check the indoor/outdoor air flow for
short cycle.
• Check the indoor unit air filter for clogging.
Gas pipe temperature B
thermistor
When a short or open circuit occurs in the gas pipe temperature B
thermistor during compressor operating.
• Check the characteristic of the gas pipe
temperature C thermistor.
• Check the connector. (CN662)
Gas pipe temperature C
thermistor
When a short or open circuit occurs in the gas pipe temperature C
thermistor during compressor operating.
• Check the characteristic of the gas pipe
temperature D thermistor.
• Check the connector. (CN662)
Gas pipe temperature D
thermistor
When a short or open circuit occurs in the gas pipe temperature D
thermistor during compressor operating.
• Check the characteristic of the fin
temperature thermistor.
• Check the connector. (CN3)
Lighting 4 times
Fin temperature
thermistor When a short or open circuit occurs in the fin temperature thermistor
during compressor operating.
P.C. board temperature
thermistor When a short or open circuit occurs in the P.C. board temperature
thermistor during compressor operating.
LED 2
(Yellow)
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