Daikin VRV Inverter K Series - Power Supply Insufficient or Instantaneous Failure

Troubleshooting (Inverter) SiE-05C
166 Troubleshooting Inverter K Series
5.6 Power Supply Insufficient or Instantaneous Failure
Remote Controller
Display
UU
UU
22
22
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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