Troubleshooting:
R
eplace the fuse
and check again
R
eplace power
wiring and
check again
D
isplay panel
circuit is damaged,
replace it
PCB is faulty,
replace
it
C
heck if fuse is
burn
t
YES
YES
YES
C
heck if power
wiring is in open
circuit
NO
NO
NO
C
heck if display
panel
ha
s 12V
power supply
PCB is faulty,
replace it
C
heck the terminal
block and the
power supply
I
f the power
terminal block
has
220V input
YES
YES
I
f the red diode
and green diode
on indoor PCB
flash in turn
R
eplace display
panel and check
again
yes
NO
NO
C
heck if display
panel and the
unit matched
well
Trouble 1: No display on the operation panel
NO
S
tart
PCB is faulty
and repl
a
ce it,
check again
R
eplace
sensor and
check again
R
eplace sensor
and check again
C
heck if sensor
resistor value is
correct
NO
NO
YES
YES
yes
C
heck if sensor is in
open circuit or PCB
port is not in good
condition
R
e-fix the sensor
and check again
A
s per the wiring
diagram,
check the
connection
between sensor
and PCB is correct
Trouble 2: Sensor failure
NO
S
tart
-72
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Содержание HCNL 821 XMR
Страница 2: ... 2 ...
Страница 76: ...12 2 Circuit diagram Outdoor Unit HCNL 821 XMR PCB layout 76 ...
Страница 78: ... 78 12 4 Circuit diagram Indoor Units HTFL 261 351 411 531 XMR ...