Commercial Air Conditioner
Model: AU182AFERA
AD182AMERA, AS182AVERA
1
2
.
T
roubleshooting
Outdoor troubleshooting:
R eplace sensor
yes
R eplace PC B
no
Below the indication on indicator board sequence
is LED 5-LED 4-LED 3-LED 2-LED 1, 0: O FF; 1: O N
1) Sensor failure
no
no
no
yes
yes
yes
For sensor failure of am bient,
suction and coil tem perature,
check if resistor R 31/R 32/R 33
value of outdoor PC B is 20K; for
discharging tem perature sensor
failure, check if R 46 is 47K
R eplace sensor
Is sensor resistance
acceptable?
R eplace sensor
Is sensor short-circuit
or open-circuit?
check if the w iring is
correct according to
w iring diagram
no
reconnect
R elocate
if sensor is fixed
w ell
A larm condition: am bient tem perature sensor is in short
circuit or open circuit for 3 seconds continously.
O utdoor indicator displays 00110 or 00111, or 01001
replace compressor
no
wiring correctly
no
compressor can
not start up
no
if compressor winding is normal, and
the each phase resistor is in balance
yes
if compressor wiring is
correct
yes
stop the unit, restart up until power
module temperature has reduced
no
no
improve the ventilation
condition
if the refrigerant
is normal
yes
if the total load
is too big
yes
yes
2) Outdoor power module failure
compressor startup procedure is
abnormal, and vibrates seriously
yes
if ventilation beside the
module radiator is good
check if module bottom temperature
is over high, more than 90degree
no
yes
yes check if the system is
blocked
check if the any current among
compressor input port U-V-W is
over high
outdoor indicator
displays 00001
Alarm condition: outdoor indicator displays 10111, 00001, or 01111, 10000, 100001,
or 10100
Re-electrified after
being powered off
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