MITSUBISHI ELECTRIC MUZ-GB50VA - Manual (Page 28)

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Outdoor unit does not operate at all, or stops immediately due to overcurrent.
F F
Check of current-limiting resistor
● Check other electric parts in the main circuit together in the case that the current-limiting resistor is defective.
Turn ON the power
supply and press
EMERGENCY
OPERATION switch.
Replace the outdoor
electronic control P.C.
board or power P.C. board
or the compressor.
Replace the noise filter P.C.
board or the outdoor
electronic control P.C.
board.
Does the rush current
limiting relay (X64) work
properly?
Open
Not
open
No
No
Yes
Yes
Is the resistance of current-limiting
resistor (R64A or R64B) on the
noise filter P.C. board normal?
(Normal resistance : 10
' i 5%)
Replace the noise filter P.C. board.
Replace the power P.C. board.
Does LED on the outdoor
electronic control P.C. board
light up?
When the current-limiting resistor is open, the rush current limiting relay (X64) may not work properly.
G G
Check of LEV
No
Yes
No
Yes
Turn on power supply to the outdoor unit after checking LEV coil is mounted to the
LEV body securely.
Is "click - click" sound heard?
Or, do you feel vibration of the LEV coil with a hand?
Disconnect the connector CN795.
Is there normal resistance to LEV coil?
Normal
Replace the outdoor electronic
control P.C. board.
Replace the LEV coil.
• When cooling, heat exchanger of non-operating indoor unit frosts.
• When heating, non-operating indoor unit get warm.
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