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