Troubleshooting | Mitsubishi Electronics MXZ-24UV

12 TROUBLESHOOTING

12-1. Cautions on troubleshooting

1.Before troubleshooting, check the following:

1)Check the power supply voltage.

2)Check the indoor/outdoor connecting wire for mis-wiring.

2.Take care the following during servicing.

1)Before servicing the air conditioner, be sure to first turn off the remote controller to stop the unit, and then after con- firming the horizontal vane is closed, turn off the breaker and / or disconnect the power plug.

2)Be sure to unplug the power cord before removing the front panel, the cabinet, the top panel, and the electronic con- trol P.C. board.

3)When removing the electronic control P.C. board, hold the edge of the board with care NOT to apply stress on the components.

4)When connecting or disconnecting the connectors, hold the housing of the connector. DO NOT pull the lead wires.

Lead wiring

Housing point

3.Troubleshooting procedure

1)First, check if the OPERATION INDICATOR lamp on the indoor unit is flashing on and off to indicate an abnormality. To make sure, check how many times the abnormality indication is flashing on and off before starting service work.

2)If the electronic control P.C. board is supposed to be defective, check the copper foil pattern for disconnection and the components for bursting and discoloration.

3)When troubleshooting, refer to the flow chart on this page and the check table on page 25, 26.

12-2. Instruction of troubleshooting

•Check the indoor unit with referring to the indoor unit service manual, and confirm that there is any problem in the indoor unit. Then, check the outdoor unit with referring to this page.

Operation start

Check the outdoor unit LED indicator

OFF

" "

Display other than " "

ACheck of power supply See page 28.

Refer to indicator list See page 25, 26.

•Indoor unit serial signal

error

B Check of serial signal See page 28.

•Cool or HEAT

opereation only C Check of R.V.coil

See page 29.

•When cooling, heat exchanger of non-operating indoor unit frosts.

•When heating, non operating indoor unit

gets warm.

D Check of LEV See page 30.

•When cooling, dew drops in the non-operating indoor unit Check of mis- piping.

•When heating, room doed not get

warm.

E Check of inverter,compressor See page 30. Check mis-piping Shortage of capacity

•When cooling, room does not

cool.

E Check of inverter, compressor See page 30.

MXZ-24UV - E2, MXZ-24UV specifications

Mitsubishi Electronics has established itself as a leader in the HVAC (heating, ventilation, and air conditioning) industry with its MXZ-24UV and MXZ-24UV - E2 models. These multi-zone heat pump systems are designed to provide exceptional efficiency, comfort, and versatility for residential and commercial applications.

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