Westinghouse WHZ09SZA21S, Service Manual, Page: 20 / 41

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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
have in trouble a. The connection between
the display board and
control board is loose;
b. The indoor control board
is failure.
c. The wiring of the display
board is failure.
2.2.When the unit has the following trouble and the compressor stops running, press the sleep button on the
remote controller for
10
times in ten seconds and the 7-segment tube of the display board will show the error
code as the following, if two malfunction happened at the same time, it need press the sleep button for
10
times again, the LED will show the other error code.
Refer to the remote controller which the sleep key can set into 4 different combination ways, when using to
check the error codes only takes effect for pressing the sleep key 10 times in ten seconds instead of 4 times.
NOTE: If the troubleshooting inquiry display by 7-segment tube, then the error code will be displayed,
otherwise only the LED of the display board can show.
Error
code
Running Timer Sleep Power Remark ：★ Light o Flash x OFF
1 2 3 4 Content Remark The root cause is may be one
of the following
- 1 9 -
Frequency dcreasing or prohibition of
frequency rising caused by too high compressor
discharge temperature
Limit to the max operating frequency caused by
too low power voltage
Operation at fixed frequency (in the case of
capability measuring or compulsory operation at
fixed frequency)
Protective frequency decreasing against outdoor
overload (overpower, over frequency conver
s
ion
rate, over torque, detection of DC under-voltage)
Frequency decreasing caused by indoor and
outdoor communication fault
Frequency decreasing or prohibition of
frequency rising protection against overload of
outdoor coiled pipe
Frequency decreasing or prohibition of
frequency rising for power-saving when it is
being used simultaneously with other appliances