6.2.
Trouble Shooting:
Trouble 1: No display on the operation panel
start
no
check if display
panel and the
unit matched
well
no
no
yes
replace display
panel and check
again
if the red diode
and green diode
on indoor PCB
flash in turn
yes
yes
if the power
terminal block is
220V input
check the terminal
block and the
power supply
PCB is faulty,
replace it
check if display
panel is 12V
power supply
no
no
no
check if power
wiring is in open
circuit
yes
yes
yes
check if fuse is
burnt
PCB is faulty,
replace
display panel
circuit is damaged,
replace it
replace power
wiring and
check again
replace the fuse
and check again
Trouble 2: Sensor failure
start
no
as per the wiring
diagram,check the
connection
between sensor
and PCB is correct
re-fix the sensor
and check again
check if sensor is in
open circuit or PCB
port is not in good
condition
yes
yes
yes
no
no
check if sensor
resistor value is
correct
replace sensor
and check again
replace
sensor and
check again
PCB is faulty
and repalce it,
check again
-
9
7-
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