Trouble Shooting - York YHKJXH012BAM--FX Service Manual

6.2. Trouble Shooting:

Trouble 1: No display on the operation panel
check if display
panel and the
unit matched
well
if the red diode
and green diode
on indoor PCB
flash in turn
check if display
no
PCB is faulty,
panel is 12V
replace it
power supply
display panel
circuit is damaged,
replace it
Trouble 2: Sensor failure
start
as per the wiring
diagram,check the
no
connection
between sensor
and PCB is correct
yes
check if sensor is in
no
open circuit or PCB
port is not in good
condition
yes
replace
sensor and
check again
start
replace display
no
panel and check
again
yes
if the power
no
terminal block is
220V input
yes
check if power
wiring is in open
circuit
yes
replace power
wiring and
check again
re-fix the sensor
and check again
check if sensor no
resistor value is
correct
yes
PCB is faulty
and repalce it,
check again
check the terminal
no block and the
power supply
yes
no
check if fuse is
burnt
yes
replace the fuse
and check again
replace sensor
and check again
125
no
PCB is faulty,
replace
yes