20
6. TROUBLE SHOOTING
INNOVAIR DC INVVERTER QUANTUM
SERVICE MANUAL
w w w . i n n o v a i r . c o m
3
×
★
★
Frequency decreasing or prohibition of
frequency rising caused by anti-freezing of
refrigeration or anti-overload in heating
4
★
×
★
Frequency decreasing or prohibition of
frequency rising caused by too high compressor
discharge temperature
5
Limit to the max operating frequency caused by
too low power voltage
6
★
★
★
Operation at fixed frequency (in the case of
capability measuring or compulsory operation at
fixed frequency)
7
Ο
×
×
Protective frequency decreasing against outdoor
overload (overpower, over frequency conversion
rate, over torque, detection of DC under-
voltage)
8
★
×
×
Frequency decreasing caused by indoor and
outdoor communication fault
9
×
★
Ο
Frequency decreasing or prohibition of
frequency rising protection against overload of
outdoor coiled pipe
10
×
★
×
Frequency decreasing or prohibition of
frequency rising for power-saving when it is
being used simultaneously with other appliances
2. Indication by the indoor unit:
2.1.
T
he 7-segment tube of the indoor display board will show the error code
automatically when the unit has the following trouble:
Error
code
Power Timer Running Sleep Remark
：★
Light o Flash x OFF
1
2
3
4
Content
Remark
The root cause is may be
one of the following
EA
the error code
will display when
the
communication
between display
board and
control board is
in trouble
a. The connection between
the display board and
control board is loose;
b. The indoor control board
fails.
c. The wiring of the display
board fails.