Daikin VRV K - Power Supply Insufficient or Instantaneous Failure

Troubleshooting (Inverter) Si-95
120 Troubleshooting Inverter K Series
4.6 Power Supply Insufficient or Instantaneous Failure
Remote Controller
Display
UU
UU
22
22
Supposed Causes ■ Power supply insufficient
■ Instantaneous power failure
■ Lack of 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) after
turning on?
"U2" blinks again.
Monitor field power supply.
The voltage
between the P and N
terminals is 320 VDC (Y1)
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-95.BOOK Page 120 Friday, March 31, 2000 10:59 AM