Daikin ERQ, Service Manual

Page: 223 / 260

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