Fault phenomenon
Fault
reason
Inspection plan
Failt clearance
The machine doesn't work, fail to turn
on the machine though there is display
on operation panel, keyboard out of
work
1,Operation panel circuit were not connected well.
2,Operation panel was damaged
3,Interruption
4, Low voltage
1,Check the circuit connection
2,Substitution method
3,Check the source of interruption, check if the
circuit was longthened by non-shield cable
4, Check the circuit voltage
5, Substitution method
1,Connect the circuit well
2,Change an operation panel
3,Avoid interruption, change the circuit with shield
cable
.。
4,Improve the circuit or add a voltage stabilizer
5,Change a CPU board
No display on operation panel and
the machine is out of work
1, The power transformer was damaged
2,The circuit on operation board was
1,Measure with a multimeter
2,Check the circuit
3,Substitution method
4,Substitution method
5,Check the source of interruption, check if
the circuit was longthened by non-shield cable
1,Chagne a power transformer
2,Iron welding
3,Change a operation panel
4, Change a CUP board
5, Avoid interruption, change the circuit with
shield cable
.
Fans don't work, no power input
for fans
1,Power cut
2,Circuit breaker
3,CPU damaged (no output)
4, The power transformer was
1, Measure the circuit voltage
2, Measure the circuit
3, Measure the output voltage
4, Measure the winding, measure the output voltage
1, Wait for power supply
2, Connect the circuit
3, Change a CPU
4, Change a transformer
Fans don't work,capacitor was
damaged
1 Capacity going down
2 Open circuit
1, Check the capacity of the capacitor
2, Measure with a multimeter
3, Measure with a multimeter
1, Change a capacitor
2, Change a capacitor
3, Change a capacitor
Fans don't' work, motor is damaged
1, Motor winding breaker
2, Motor winding short circuit
3, Motor winding grounding
Measure the winding
Change a motor
Compressor doesn't work, no power
for compressor terminal (No voltage
output for CPU)
1, The machine is not turned on
2, Set temperature is lower than water temperature
3, CPU is damaged
4, Power transformer was damaged'
5, Power cut
1, Check the operation panel
2, Check the set temperature
3, substitution method
4, substitution method
5, Measure the circuit voltage
1, Turn on the machine
2, Reset
3, Change a CPU
4, Change a power transformer
5, Wait for power supply
Compressor doesn’t work,
outlay thermal relay broken
1,Capacitor is damaged
2,Out lay protector of overloading extraposition
is damaged.
1, Check the capacity of capacitor
2, Measuring the value of protector resistance
1, Change a capacitor
2, Change a overloading protecto
Compressor doesn’t work,
built-in thermal relay broken
1,Short of cryogen
2,Low voltage
3,Blockage piston of compressor
4,Compressor is Short of oil with big noise and
high temperatur
1, Measure the voltage, current, water temperature
parameter
2, Measure the voltage
3, Measure the pressure, current, water temperature
parameter
4, Hear the noise, measure the compressor
temperature
1, Fill in cryogen
2, Improve the circuit or add a voltage stabilizer
3, Make shunt capacitance
,
fill in
refrigeration oil
4, Fill in refrigeration oil
No defrost or bad defrost effect
1, Fault of defrost temperature Sensor
2, Loose of defrost temperature Sensor
3, No defrost on defrost temperature Sensor position
4, Defrost inspection time is too long
5, Defrosting setting is not approperate
6, Four-way valve doesn't work or damaged four-way
valve coil
8, four-way valve Gas leakage
9, CPU is damaged
1, Check if the connection of defrost temperature
sensor is correct
2, Check if the connection of defrost temperature
sensor is correct
3, Visual inspection
4, Check the defrosting inspection time
5, Defrosting Temperature point was set too high
6, Check the winding
7, Knock the four-way valve
8, Feel the temperature of the four-way valve,
measure parameters like current and voltage etc
9, Force the defrosting work and check if there is
power output on CPU
1, Change a sensor
2, Change a sensor
3, Adjust the assembling position
4, Reset the time
5, Adjust the temperature value
6, Change a coil
7, Change a four-way valve
8, Change a four-way valve
9, Change a CPU
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