Communication Error Between Inverter Pcb And Outdoor Control Pcb - Mitsubishi Heavy Industries KX6 series Service Manual

Error code
E45
Remote controller:
E45-1
7-segment display:
1. Applicable model
Outdoor unit
2. Error detection method
When the communication
between inverter PCB and
outdoor control PCB is not
established.
3. Condition of error displayed
Same as above.
4. Presumable cause
• Signal wire anomaly
• Outdoor control PCB
anomaly
• Inverter PCB (INV1)
anomaly
• Rush current prevention
resistor anomaly
Note: If the error does not recur, connect the Mente PC and continue to collect data.
LED Green Red
Keeps flashing Stays Off
Indoor
inverter PCB and outdoor control PCB
Keeps flashing 1 time flash
Outdoor
5. Troubleshooting
Diagnosis
Save data for 30 minutes before stopping in Mente PC
Is 15V
of power for control PCB
detected? Is the outdoor fan motor OK?
(Refer the checking method of 15V
in page 41)
YES
Reset power supply and restart
Does E45 recur?
YES
Turn off the power.
IS the harness and/or
connector between inverter
PCB and outdoor control
PCB OK ?
YES
Is the rush
current prevention resistor
broken?
NO
Is the
harness and/or connector
between
inverter PCB and diode module
OK?
YES
Is the
setting of switches on the inverter
PCB OK? *
* Switch setting of inverter PCB
SW1-1 OFF
SW1-2 OFF
SW1-3 OFF
SW1-4 OFF
JSW1-1 ON
JSW1-2 OFF
JSW1-3 OFF
JSW1-4 OFF
86
–
Content
Communication error between
NO
NO
NO
YES
NO
NO
YES
–
'10 • KX-SM-148
Countermeasure
Check and save the data of
operating conditions
Replace inverter PCB or
outdoor fan motor
Check it as much as
possible under the operating
conditions for 30 minutes
before error occurred
Wait and see.
Continue to obain data, if
possible (Keep connecting
the Mente PC)
Check whether the harness
is broken?
Check whether the
connector is loose?
 If there is problem,
correct it.
Disconnect the harness
from the resistor and
measure the resistance.
If broken, replace the
resistor.
In such case check the
harness between diode
module and inverter PCB
as well
Check whether the harness
is broken?
Check whether the
connector is loose?
 If there is problem,
correct it.
Correct the setting of
switches on the inverter
PCB
Replace outdoor control
PCB