Daikin FCQ18PVJU Service Manual page 142

Troubleshooting by Indication on the Remote Controller
Troubleshooting
NO
135
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts could be damaged.
Has
the indoor
or outdoor unit
P.C.B. been replaced,
or has the indoor - outdoor
or outdoor - outdoor unit
transmission wiring
been
modified?
NO
All
indoor unit
remote controllers of the
same refrigerant system
display
U4
" ."
YES
Reset the power supply.
Outdoor
unit P.C.B.
microcomputer monitor
(HAP) blinks.
YES
Operation
ready lamp (H2P) is
blinking.
YES
Lamp does
YES
not go off for 12 minutes
or more.
NO
Is
indoor - outdoor
and outdoor - outdoor unit
transmission wiring
normal?
YES
YES
Is indoor
NO
- outdoor and outdoor -
outdoor unit transmission
wiring normal?
NO
The
voltage between
NO
terminals L1 and N of the
outdoor unit P.C.B.
is 208~230 V.
YES
The fuse on
the outdoor unit's P.C.B.
is burnt.
NO
NO
SiUS28-902_a
Push and hold the RESET
button on the master outdoor
unit P.C.B. for 5 seconds.
* The unit will not operate for
up to 12 minutes.
YES
Replace the indoor unit P.C.B.
Fix the indoor/outdoor unit
transmission wiring.
NO
Supply 208~230 V.
YES
Replace the fuse.
Replace the outdoor unit
P.C.B. (A1P).
Push and hold the RESET
button on the outdoor unit
P.C.B. for 5 seconds.
Fix the indoor/outdoor unit
transmission wiring.
Replace the outdoor unit
P.C.B. (A1P).
Troubleshooting