Haier HF50CM23NW Service Manual page 19

SERVICE MANUAL
Mod el: HF50CM23NW/HF71CM33NW
8-2-2.Compressor no start
Compressor no start
Check if the home power is
connecter
YES
Check if thermostat is set at "0"
NO
Check if the thermostat is normal
YES
Check if the starter is normal?
YES
Check if the overload protector is
normal?
YES
Check if the run capacitor is
normal?
YES
Check if each connector of starter
overload protector, run capacitor
are in good condition?
YES
Check if the compressor is normal?
YES
Check if the starting current of
compressor excess too much?
NO
Connect the power
YES
Adjust thermostat setting position
Ambient temperature >25℃ 1~3 Grade
Ambient temperature <25℃
Test if the thermostat is normal under power on status:
Setting thermostat to coldest position (7 grade); observe if the machine can be started.
If compressor still not start, it means that the thermostat maybe failure.
Test if resistance of PTC starter if it is ZERO or INFINITE, means the
starter is out of work. For PTC starter, when shake it, it should not have
noise, if it has, means the starter Magnetic Disk burned.
1.
Measure whether two ends of overload protector is through
using multimeter Ohm grade. Not thorough means protector is
defective.
2. Measure starting current and running current of compressor
using clamp-type tester. If overload protector act when current is
normal, means protector failure and should be replaced.
Before measurement, remove the capacitor from circuit firstly,
and then connect two terminals for discharge.
1. IF the finger of multimeter swings to 0 quickly and then
swings
back slowly when measuring two poles of capacitor, it means the
run capacitor is normal.
2. If the finger of multimeter does not swing, it means the run
capacitor is open circuit. If the finger of mlimeter swings to 0 and
stops means it is short circuit, if it stops on any other position, it
means the capacitor leaka
Check each connectors of the starter overload protector and
run capacitor, ensure each contact is in good condition, then
power on and retest the machine.
Test the resistance parameter of the compressor; if it is
ZERO, inner winding is short circuit. if it is infinite, inner
winding is break circuit
If all technical parameter of compressor and compressor accessories (starter,
overload protector, run capacitor) are normal after above test, but compressor
still can not be started, and overload protector action, the actual starting
current excess too much. This phenomenon usually caused by compressor
inner mechanical failure (cylinder-block or axis-hung problem).
Issue 2014-04-12
Rev.
4~7 Grade
ge.
Ref1404S005V0
19
Compressor
NOT
accessories
NORMAL
failure
NOT
Compressor
NORMAL
accessories
failure
NOT
Compressor
NORMAL
accessories
failure