Daikin ALTHERMA HT Service Manual page 213

ESIE09-08B
Troubleshooting
NO

Troubleshooting
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
Caution
Has
the indoor
or outdoor unit
PC board been
replaced, or has the indoor -
outdoor unit transmission
wiring been
modified?
NO
Indoor unit
remote controller
displays "U4"
YES
Reset the power supply.
Outdoor unit
PC board microcomputer
monitor (HAP) blinks.
YES
either the fuse
F4U on the outdoor
unit PC board (A1P) or the
fuse F1U on the inverter
PC board (A2P)
Operation
ready lamp (H2P) is
blinking.
YES
Lamp does not
go off for 12 minutes or
more.
NO
Is
indoor -
outdoor unit
transmission wiring
normal?
YES
Check No.3 : Refer to information on P211.
Troubleshooting by Indication on the Remote Controller
YES
Is
indoor -
NO outdoor unit
transmission wiring
normal?
NO
Are there
any broken wires in
NO
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.
Has
YES
blown out?
resistance
between pins in excess of
NO
judgment criteria?
YES
NO
YES
Replace the indoor unit PC
board (A1P).
Fix the indoor/outdoor unit
transmission wiring.
NO
Repair the broken wires, and
then restart operation.
NO
Supply 220~240 V.
YES
Replace the fuse.
Is
NO
Replace the fuse F4U and
the inverter PC board (A2P).
Replace the fan motor.
YES
Replace the inverter PC
board (A2P).
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 indoor/outdoor unit
transmission wiring.
Replace the outdoor unit PC
board (A1P).
(V3187)
201