A/A DC INVERTER U-MATCH AIR CONDITIONERS MAINTENANCE
128
DC Bus Low Voltage Protection
E5 is displayed
on the wired
controller.
If the reactor is
tightened?
DC Bus Low Voltage
Protection
PL
Monitor Display
Main Board 88
Indicating Lamp
Yes
No
Record and report the
actual conditon
If the malfunction is
eliminated after the
reactor is tightened
securely?
If power supply voltage is
too low, please cut off the
power; otherwise the unit
would be damaged.
If the input terminals L1,
L2, L3 are connected
properly?
If the input voltage is
lower than 320 V?
Yes
No
Replace the main board
Yes
Yes
No
No
If the malfunction is
eliminated after the
terminals L1, L2, L3 are
connected properly?
No
Yes
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