Si33-105 Troubleshooting (Inverter)
Troubleshooting R407C PLUS Series Heat Recovery System 201
5.6 Power Supply Insufficient or Instantaneous Failure
Remote
Controller
Display
U2
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
NO
NO
Turn on again.
Replace the outdoor
unit PC board. (A1P)
YES
YES
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 in A2P?
Replace the inverter
unit. (A2P)
Replace the inverter
unit. (A2P)
There was an
instantenious power
failure or noise etc.
Replace the inverter
unit. (A2P)
YES
NO
NO
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 on
Power unit in PCB A2P is
320 VDC (Y1) or more
when the
compressor
is running.
YES
NO
Is 220 ~ 240 V
at the connector of X5A of
outdoor PC board
side?
Check
the transmission
wiring between the outdoor
unit PC board and
inverter unit.
YES
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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