Power Supply Insufficient Or Instantaneous Failure - Daikin VRV R-407C PLUS Series Service Manual

Troubleshooting (Inverter)
5.6

Power Supply Insufficient or Instantaneous Failure

U2
Remote Controller
Display
Supposed Causes
Troubleshooting
164
Power supply insufficient
Instantaneous failure
Open phase
Defect of inverter unit
Defect of outdoor PC board
Defect of K1M.
Main circuit wiring defect
Turn on again.
Turn K1M ON.
YES
The voltage
between the P and N
terminals is 320 VDC (Y1)
or morewhen the
compressor
is running.
"U2" blinks again.
Monitor field power supply.
NO
Is 220 ~ 240 V of power
reaching the K1M
coil?
NO
Does
the voltage
between terminals P
and N gradually rise to 339
VDC (Y1) after turning
on?
NO
Is 220 ~ 240 V at
the connector of X1A.
NO
Is 220 ~ 240 V
at the connector of X5Aof
outdoor PC board
side?
YES
Check
the transmission
wiring between the outdoor
unit PC board and
inverter unit.
YES
Replace K1M.
YES
Replace the inverter unit.
YES
Replace the inverter unit.
NO
Replace the outdoor unit
PC board.
Troubleshooting R-407C PLUS Series
SiE 00-07
(VF068)