Troubleshooting by Remote Controller Si20-701_B
451
Supposed Causes
îš„ Defective transmission wiring between the indoor and
outdoor units
îš„ Mismatching of wiring and piping
îš„ Refrigerant shortage
îš„ Clogged refrigerant piping system
Troubleshooting
Does
"UF" appear
when the power is
turned ON?
YES
NO
Except RZQG
The
phase of
transmission wiring
between the indoor and
outdoor units is
incorrect.
Continue
the condition
that the blinking
interval of HAP on
outdoor unit PCB is
short (∗1) for more
than one
minute.
Correctly connect
transmission
wiring between
the indoor and
outdoor units.
The phase of
transmission wiring
between the indoor and
outdoor units is incorrect.
RZQG
Caution
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
Correctly
connect
transmission
wiring between
the indoor and
outdoor units.
Is the
connection of
transmission wiring
and piping between the
indoor and outdoor
units
matched?
NO
NO
YES
YES
Match the
connection of the
transmission
wiring and piping
between the
indoor and
outdoor units.
A
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