Haier Unitary smart series Service Manual page 172

9.2 Troubleshooting for inverter units
Outdoor troubleshooting:
B elow the indication on indicator board sequence
is LE D 5-LE D 4-LE D 3-LE D 2-LE D 1, 0: O FF; 1: O N
1 ) S ensor failure
A larm condition: am bient tem perature sen sor is in short
circuit or open circuit for 3 seconds con tinously.
O utdoor indicator displays 00110 or 0 0111, or 01001
check if the w iring is
correct according to
w iring diagram
if sensor is fixed
w ell
yes
Is sensor resistance
acceptable?
yes
Is sensor sho rt-circuit
or open-circuit?
no
For sensor failure of am bient,
suction and coil tem perature,
check if resistor R 31/R 32/R 33
value of outdoor P C B is 20K ; for
d ischargin g tem perature sensor
failure, check if R 46 is 47K
yes
R e place sensor
2) Outdoor power module failure
Alarm condition: outdoor indicator displays 10111, 00001, or 01111, 10000, 100001,
or 10100
outdoor indicator
displays 00001
Re-electrified after
being powered off
yes
check if the any current among
compressor input port U-V-W is
over high
no
check if module bottom temperature
is over high, more than 90degree
yes
compressor startup procedure is
abnormal, and vibrates seriously
no
compressor can
not start up
no
reconnect
no
R elocate
no
R eplace sensor
yes
R eplace sensor
no
R eplace P C B
yes check if the system is
blocked
yes
if ventilation beside the
module radiator is good
no
improve the ventilation
condition
yes
if compressor wiring is
correct
no
wiring correctly
a__
yes yes
if the total load
is too big
no
stop the unit, restart up until power
module temperature has reduced
if compressor winding is normal, and
yes
the each phase resistor is in balance
no
replace compressor
-172-
^ a` a`
if the refrigerant
is normal