Mitsubishi KXZ Series - Page 262

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260
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'20 • KX-T-373
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106
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'20 • KX-T-373
E45
E45
Communication error between
inverter PCB and outdoor unit control PCB (2)
Stays Off
1. Applicable model
5. Troubleshooting
Outdoor unit
Diagnosis Countermeasure
NO
Replace the outdoor unit
control PCB.
Replace inverter PCB.
2. Error detection method
3
. Condition of error displayed
If the communication between
inverter PCB and outdoor unit
control PCB is not established.
4. Presumable cause
• Faulty inverter PCB
• Faulty connector between
inverter PCB and outdoor unit
control PCB
• Faulty outdoor unit control PCB
Note:
Error code
Remote control:
7-segment display:
LED Green Red
Indoor
Outdoor
Content
YES
YES
In case of:
LED on inverter PCB stays OFF
A
From previous page.
Disconnect CNI3
Is DC15V
output OK? (between
“TP_15V_+” and “TP_GND2”
on the control PCB)
NO
Is DC20V
output OK? (between
“TP_20V_+” and “TP_GND2”
on the control PCB)
*Check after 52C1 relay turned on
by cool/heat operating.
(between CNA1 1 and 3 pin)
Replace the outdoor unit
control PCB.
YES
A
From previous page.
NO
Dose capacitor C1 have
voltage over 200V?
*Check after 52C1 relay turned on
by cool/heat operating.
[For single phase model]
[For three phase model]
Main circuit faulty is
suspected.
Check the 52C1 relay, diode
module and cementing
resistor (R1 and R2)
condition.
Replace inverter PCB.
Faulty main circuit connection
(Three phase model)
Faulty relay or cementing resistor
(Three phase model)
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