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Troubleshooting (Inverter)
SiE-05C
166
Troubleshooting Inverter K Series
5.6
Power Supply Insufficient or Instantaneous Failure
Remote Controller
Display
UUU
U2222
Supposed Causes
Power supply insufficient
Instantaneous failure
Open phase
Defect of inverter unit
Defect of outdoor PC board
Defect of K1M.
Main circuit wiring defect
Troubleshooting
(VF068)
Replace K1M.
NO
Turn on again.
Replace the outdoor unit PC board.
YES
Turn K1M ON.
YES
NO
Is 220 ~ 240 V of power
reaching the K1M
coil?
Is 220 ~ 240 V at
the connector of X1A.
Replace the inverter unit.
Replace the inverter unit.
YES
NO
YES
Does
the voltage
between terminals P
and N gradually rise to 339
VDC (Y1, YAL) or 311 V
(TAL) after turning
on?
"U2" blinks again.
Monitor field power supply.
The voltage
between the P and N
terminals is 320 VDC (Y1,
YAL) or 209 V (TAL) or more
when the compressor
is running.
NO
NO
Is 220 ~ 240 V of outdoor
PC board side?
Check
the transmission
wiring between the outdoor
unit PC board and
inverter unit.
YES
SI-05C.BOOK Page 166 Monday, November 6, 2000 4:13 PM
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