Haier 3U19FS1ERA Service Manual - Page 98

Trouble Shooting

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>_]]VbTZR\ _^UZdZ_^Vb 6.2. Trouble Shooting: Trouble 1: No display on the operation panel start check if display panel and the unit matched well yes if the red diode and green diode on indoor PCB flash in turn yes PCB is faulty, no check if display panel is 12V replace it power supply no replace display panel and check again if the power check the terminal no terminal block is no block and the 220V input power supply yes check if power wiring is in open no check if fuse is circuit burnt no PCB is faulty, replace yes display panel circuit is damaged, replace it yes replace power wiring and check again yes replace the fuse and check again Trouble 2: Sensor failure start as per the wiring diagram,check the connection between sensor and PCB is correct yes check if sensor is in open circuit or PCB port is not in good condition yes replace sensor and check again no re-fix the sensor and check again no check if sensor no resistor value is correct yes PCB is faulty and repalce it, check again replace sensor and check again -97-

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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
±²³³´µ¶·¸¹ º·µ ±²»¼·½·²»´µ
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9
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