Daikin ERQ Service Manual page 223

ESIE09-05
Troubleshooting
NO
∗
Check No.3
Troubleshooting
Be sure to tu rn off power switch before connect or disconnect connecto r,
Caution
or pa rts damage m ay be occurred .
Has
the AHU
or outdoor unit PC
board been replaced,
YES
or has the AHU - outdoor
or outdoor - outdoor unit
transmission wiring
been
modified?
NO
All
AHU
NO
remote controllers of the
same refrigerant system
display
U4
" ."
YES
Reset the power supply.
Outdoor
NO
unit PC board
microcomputer monitor
(HAP) blinks.
YES
Has either
the fuse F4U on the
outdoor unit PC board
(A1P) or the fuse F1U on the
inverter PC board (A2P)
blown out?
Operation
ready lamp (H2P) is
blinking.
YES
Lamp does
YES
not go off for 12 minutes
or more.
NO
Is
AHU - outdoor
NO
and outdoor - outdoor unit
transmission wiring
normal?
YES
: Refer to information on P.226.
Troubleshooting by Indication on the Remote Controller
Is AHU -
outdoor and outdoor -
outdoor unit transmission
wiring normal?
NO
Are there any
broken wires in the connectors
of the inverter PC board (A1P) and the
control PC board (A2P)?
YES
The
voltage between
terminals L3 and N of the
outdoor unit PC board
is 220~240 V.
YES
The fuse F3U on
NO
the outdoor unit's PC
board is burnt.
YES
Check No. 3
Check for the fan motor
connector.
Is
resistance
between pins in excess of
NO
judgment
criteria?
YES
: http://splitoff.ru/tehn-doc.html
Push and hold the RESET
button on the master outdoor
unit PC Board for 5 seconds.
∗ The unit will not operate for
up to 12 minutes.
YES
Replace the AHU PC board.
Fix the AHU/outdoor unit
transmission wiring.
NO
Repair the broken wires, and
then restart operation.
NO
Supply 220~240 V.
YES
Replace the fuse.
∗
NO
Replace the fuse F4U and
the inverter PC board (A2P).
Replace the fan motor.
Replace the inverter PC
board.
Replace the fuse F4U.
Replace outdoor unit PC
board (A1P).
Push and hold the RESET
button on the outdoor unit PC
board for 5 seconds.
Fix the AHU/outdoor unit
transmission wiring.
Replace the outdoor unit PC
board (A1P).
(V3187)
213