Troubleshooting - Mitsubishi Electric MXZ-2F33VF4-E1 Service Manual

12

TROUBLESHOOTING

MXZ-2F33VF MXZ-2F42VF
MXZ-2F33VF2 MXZ-2F42VF2
MXZ-2F33VF3 MXZ-2F42VF3
MXZ-2F33VF4 MXZ-2F42VF4
MXZ-3F54VF MXZ-3F68VF
MXZ-3F54VF2 MXZ-3F68VF2
MXZ-3F54VF3 MXZ-3F68VF3
MXZ-3F54VF4 MXZ-3F68VF4
MXZ-4F83VF MXZ-5F102VF
MXZ-4F83VF2 MXZ-5F102VF2 MXZ-6F122VF
MXZ-2F53VFHZ2 MXZ-4F83VFHZ
MXZ-2F53VFHZ2 MXZ-4F83VFHZ2
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 miswiring.
2. Take care of the following during servicing
1) Before servicing the air conditioner, be sure to turn OFF the unit first with the remote controller, and after confirming the
horizontal vane is closed, turn OFF the breaker and/or disconnect the power plug.
2) Be sure to turn OFF the power supply before removing the front panel, the cabinet, the top panel, and the P.C. board.
3) When removing the electrical parts, be careful of the residual voltage of smoothing capacitor.
4) When removing the P.C. board, hold the edge of the board with care NOT to apply stress on the components.
5) When connecting or disconnecting the connectors, hold the connector housing. DO NOT pull the lead wires.
3. Troubleshooting procedure
1) Check if the OPERATION INDICATOR lamp on the indoor unit is blinking on and off to indicate an abnormality. To make
sure, check how many times the OPERATION INDICATOR lamp is blinking on and off before starting service work.
2) Before servicing, verify that all connectors and terminals are connected properly.
3) When the electronic control P.C. board seems to be defective, check for disconnection of the copper foil pattern and
burnt or discolored components.
4) Refer to 12-2, 12-3 and 12-4.
12-2. FAILURE MODE RECALL FUNCTION
This air conditioner can memorize the abnormal condition which has occurred once.
Even though LED indication listed on the troubleshooting check table (12-4.) disappears, the memorized failure details
can be recalled.
1. Flow chart of failure mode recall function for the indoor/outdoor unit
Refer to the service manual of indoor unit.
OBH790L
MXZ-2F53VF
MXZ-2F53VF2
MXZ-2F53VF3
MXZ-2F53VF4
MXZ-4F72VF
MXZ-4F72VF2
MXZ-4F72VF3
MXZ-4F72VF4
MXZ-6F120VF2
<Incorrect>
<Correct>
Lead wiring
Connector housing
179
MXZ-2F53VFH
MXZ-2F53VFH2
MXZ-2F53VFH3
MXZ-2F53VFH4
MXZ-4F80VF2
MXZ-4F80VF3
MXZ-4F80VF4