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9.2 Troubleshooting for inverter units
Outdoor troubleshooting:
Re
p
lace sensor
yes
Replace PCB
no
Below the indication on indicator board sequence
is LED5-LED4-LED3-LED2-LED1, 0: OFF; 1: ON
1) Sensor failure
no
no
no
yes
yes
yes
For sensor failure of ambient,
suction and coil temperature,
check if resistor R31/R32/R33
value of outdoor PCB is 20K; for
discharging temperature sensor
failure, check if R46 is 47K
Replace sensor
Is sensor resistance
acceptable?
Replace sensor
Is sensor short-circuit
or open-circuit?
check if the wiring is
correct according to
wiring diagram
no
reconnect
Relocate
if sensor is fixed
well
Alarm condition: ambient temperature sensor is in short
circuit or open circuit for 3 seconds continously.
Outdoor 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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