Panasonic NR-BN30PGW / NR-BN30PGB / NR-BN30PS1 / NR-BN30QGW / NR-BN30QGB / NR-BN30QW1 / NR-BN30QS1 Service Manual ▷ View online
21
4) Motor troubles and other electric faults
a) Motor windings have been burned or short-circuited between turns Analysis of Trouble
When motor windings have been burned or short-circuited between turns, the fuse will be blown
repeatedly, and the blowout occurs particularly at the instant when you close the knife switch.
Remedy Check the terminals and the outer casing to see whether they are short-circuited, and
measure the resistance of each phase with an ohmmeter. If short circuit occurs or the resistance of
a certain phase is low, this means that short circuit does exist in the windings and/or between turns,
and insulation layers have been burned or deteriorated. A multimeter can be used in this inspection,
too. I f the insulation resistance is lower than 2 M
a) Motor windings have been burned or short-circuited between turns Analysis of Trouble
When motor windings have been burned or short-circuited between turns, the fuse will be blown
repeatedly, and the blowout occurs particularly at the instant when you close the knife switch.
Remedy Check the terminals and the outer casing to see whether they are short-circuited, and
measure the resistance of each phase with an ohmmeter. If short circuit occurs or the resistance of
a certain phase is low, this means that short circuit does exist in the windings and/or between turns,
and insulation layers have been burned or deteriorated. A multimeter can be used in this inspection,
too. I f the insulation resistance is lower than 2 M
, this means that the insulation layer is already
breakdown. If the motor has been burned, repair it or replaced it with a new one.
b) Fault of control relay
Analysis of Trouble
Overheat burnout or wear of control relay contacts may occur generally. All these will cause poor
contact in electricity.
Remedy
Dismantle it to repair, or replace it with a new one.
c) Poor electric contactor in thermostat
Analysis of Trouble
Burnout of contactor and leakage of temperature sensing agent may occur generally.
Remedy
Replace the old with a new one.
d) Check the terminals for loose connection and electric circuits for other abnormal phenomena.
5) Mechanical faults of compressor
a) Seizing of shaft
This phenomenon is caused mostly by poor lubrication, such as insufficient quantity of lubricant,
clogging in the lubricant oil line, or intermittent lubricant oil supply. Dirt and other impurities in the
lubricant oil will increase its viscosity and cause the shaft to be seized. Copper plating may also
result in seizing of shaft.
b) Seizing of piston
This is caused by too small fit clearance between the piston and cylinder or expansion due to heat.
Judgement of seizing shaft and piston: After the refrigerator has been powered on, the compressor
will not start and run, but a slight hum sound can be heard, and several seconds later, thermal
protective relay will actuate and make the contacts open; this process will occur repeatedly, but the
compressor cannot be started.
E. Compressor won't stop
Sometimes, the compressor will run continuously (for several hours or run without end), If the food
placed in the refrigerator is not too much, there may be the following two situations: i) the refrigerator
very low, this means that the control system is probably out of order; ii) the control system works
normally, and there are troubles in the refrigerating system or other parts.
b) Fault of control relay
Analysis of Trouble
Overheat burnout or wear of control relay contacts may occur generally. All these will cause poor
contact in electricity.
Remedy
Dismantle it to repair, or replace it with a new one.
c) Poor electric contactor in thermostat
Analysis of Trouble
Burnout of contactor and leakage of temperature sensing agent may occur generally.
Remedy
Replace the old with a new one.
d) Check the terminals for loose connection and electric circuits for other abnormal phenomena.
5) Mechanical faults of compressor
a) Seizing of shaft
This phenomenon is caused mostly by poor lubrication, such as insufficient quantity of lubricant,
clogging in the lubricant oil line, or intermittent lubricant oil supply. Dirt and other impurities in the
lubricant oil will increase its viscosity and cause the shaft to be seized. Copper plating may also
result in seizing of shaft.
b) Seizing of piston
This is caused by too small fit clearance between the piston and cylinder or expansion due to heat.
Judgement of seizing shaft and piston: After the refrigerator has been powered on, the compressor
will not start and run, but a slight hum sound can be heard, and several seconds later, thermal
protective relay will actuate and make the contacts open; this process will occur repeatedly, but the
compressor cannot be started.
E. Compressor won't stop
Sometimes, the compressor will run continuously (for several hours or run without end), If the food
placed in the refrigerator is not too much, there may be the following two situations: i) the refrigerator
very low, this means that the control system is probably out of order; ii) the control system works
normally, and there are troubles in the refrigerating system or other parts.
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1) Temperature is set improperly
a) The temperature control knob is set to the "coldest" position. This position is to be used for fast
freezing or continuous running, its temperature for power off is too low, therefore, the compressor
won't stop and the temperature in the refrigerator becomes lower and lower .
b) Inspection method: check the temperature control knob to see whether it is set in the position
"coldest".
2) Thermostat is malfunctioning and makes the compressor running continuously
Analysis of Trouble
When the thermostat doesn't work normally, it will make the compressor run continuously, and
hence very low temperature will be achieved in the refrigerator. The fault is generally due to the fact
that the contacts of the thermostat cannot be released.
Remedy
Dismantle the thermostat and make a through checkup, if it is totally out of functioning, replace it
with a new one.
3) Evaporation temperature is too high in refrigerating system, resulting in lower refrigerating
capacity and hence continuous running of compressor
Analysis of Trouble
Leakage of refrigerant and clogging in a refrigerating system will directly affect its refrigerating
capacity. Due to the reduction in its refrigerating capacity, the refrigerator temperature cannot reach
its rated value, the thermostat won't work, thus the compressor runs continuously. When the
evaporation temperature in the system is too high, the temperature sensing agent in the
temperature sensor is also hotter, therefore, the thermostat is unable to cut off the power supply to
the compressor and stop it.
Remedy
If it has been found that the refrigerant in the system is insufficient in quantity, recharge it with
refrigerant. In case clogging occurs, disassemble the part where it is blocked. If the evaporation
temperature is too high, settle this problem with an appropriate quantity of refrigerant.
4) No stoppage of compressor due to damaged heat-insulation layer inside case body and/or door
seal Analysis of Trouble
When the heat-insulation layer inside the case body deteriorates or the door seal is not closely
touches the door frame, the temperature in the refrigerator will rise and makes the compressor
running continuously. Remedy Check the heat-insulation layer for its damaged parts, repair it to
improve its heat-insulation property. If the door has deformed or the door seal is not tightly sealed
against the case body, repair them, respectively.
5) Too much food is placed in the refrigerator, or is placed too densely, resulting in poor ventilation
or poor conditions for temperature sensing, and hence no stoppage of the compressor.
6) Too high ambient temperature, poorer ventilation and heat dissipation make the compressor
running without stop.
F. Electric leakage of refrigerator
a) The temperature control knob is set to the "coldest" position. This position is to be used for fast
freezing or continuous running, its temperature for power off is too low, therefore, the compressor
won't stop and the temperature in the refrigerator becomes lower and lower .
b) Inspection method: check the temperature control knob to see whether it is set in the position
"coldest".
2) Thermostat is malfunctioning and makes the compressor running continuously
Analysis of Trouble
When the thermostat doesn't work normally, it will make the compressor run continuously, and
hence very low temperature will be achieved in the refrigerator. The fault is generally due to the fact
that the contacts of the thermostat cannot be released.
Remedy
Dismantle the thermostat and make a through checkup, if it is totally out of functioning, replace it
with a new one.
3) Evaporation temperature is too high in refrigerating system, resulting in lower refrigerating
capacity and hence continuous running of compressor
Analysis of Trouble
Leakage of refrigerant and clogging in a refrigerating system will directly affect its refrigerating
capacity. Due to the reduction in its refrigerating capacity, the refrigerator temperature cannot reach
its rated value, the thermostat won't work, thus the compressor runs continuously. When the
evaporation temperature in the system is too high, the temperature sensing agent in the
temperature sensor is also hotter, therefore, the thermostat is unable to cut off the power supply to
the compressor and stop it.
Remedy
If it has been found that the refrigerant in the system is insufficient in quantity, recharge it with
refrigerant. In case clogging occurs, disassemble the part where it is blocked. If the evaporation
temperature is too high, settle this problem with an appropriate quantity of refrigerant.
4) No stoppage of compressor due to damaged heat-insulation layer inside case body and/or door
seal Analysis of Trouble
When the heat-insulation layer inside the case body deteriorates or the door seal is not closely
touches the door frame, the temperature in the refrigerator will rise and makes the compressor
running continuously. Remedy Check the heat-insulation layer for its damaged parts, repair it to
improve its heat-insulation property. If the door has deformed or the door seal is not tightly sealed
against the case body, repair them, respectively.
5) Too much food is placed in the refrigerator, or is placed too densely, resulting in poor ventilation
or poor conditions for temperature sensing, and hence no stoppage of the compressor.
6) Too high ambient temperature, poorer ventilation and heat dissipation make the compressor
running without stop.
F. Electric leakage of refrigerator
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1) Slight electric leakage
Electric insulation has deteriorated due to being affected with damp, thus resulting in slight electric
leakage.
2) Serious electric leakage
Refrigerator case has become live due to faults occurred in some electric devices or the erroneous
wiring in installing power cord plug or outlet by the user. This is very dangerous.
3) Electric leakage test
a) Slight electric leakage
A tingle sense will be experienced as soon as you touch the metal parts of the refrigerator with your
hand .When you test them with a test pencil, its neon lamp will come on .In that case, the first thing
you need to do is to determine whether the grounding is perfect .If the grounding is no problem, turn
off the refrigerator immediately, then check the insulation of electric circuits with an multimeter.
b) Serious electric leakage
Never touch the case body of the refrigerator, its door handle or other metal parts with your
hand .Test the refrigerator with a test pencil, it will light up intensively ;measure the resistance
between the power cord plug and the case body with an avometer, the reading will be zero (0
); in
the worst case, the fuse will be blown .Check the 3-prong outlet to see whether the live wire and the
null line are inversely connected, this makes the ground protection lead-out from the power cord
plug being connected to the live wire .Another possibility is that the live wire and null line of the
outdoor power supply circuit have been inversely connected accordingly, this makes the null line
become a live wire .
G .Stronger vibration and loader noise
1) Refrigerator placed improperly
a) Uneven ground
Uneven ground will cause there frigerator to be placed unsteadily, causing stronger vibration and
noise during its operation .
b) Leveling screws not properly adjusted
If the leveling screws on refrigerator legs have not been adjusted properly, vibration and noise will
still occur even if the refrigerator has been placed on a level ground.
2) Abnormal noise from compressor
Three suspended spring inside the compressor case are out of balance, and strike against the case,
moreover, the wear of compressor parts may cause noise sometimes.
3) Resonance of tubing and loosening of parts
Improper and compact laying of tubes or the loosening of parts may cause vibration and noise.
null line are inversely connected, this makes the ground protection lead-out from the power cord
plug being connected to the live wire .Another possibility is that the live wire and null line of the
outdoor power supply circuit have been inversely connected accordingly, this makes the null line
become a live wire .
G .Stronger vibration and loader noise
1) Refrigerator placed improperly
a) Uneven ground
Uneven ground will cause there frigerator to be placed unsteadily, causing stronger vibration and
noise during its operation .
b) Leveling screws not properly adjusted
If the leveling screws on refrigerator legs have not been adjusted properly, vibration and noise will
still occur even if the refrigerator has been placed on a level ground.
2) Abnormal noise from compressor
Three suspended spring inside the compressor case are out of balance, and strike against the case,
moreover, the wear of compressor parts may cause noise sometimes.
3) Resonance of tubing and loosening of parts
Improper and compact laying of tubes or the loosening of parts may cause vibration and noise.
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4) Inspection method
To find the sources of noise, press the vibration spot with your hand while the refrigerator is in
operation and listen attentively whether the vibration becomes weake or vanishes. If the refrigerator
has not been levelly placed, put a level meter on its top table and adjust the leveling screws on its
legs .In case noise occurs from the compressor, strike different locations on the side surface of its
case using a rubber hammer or hand hammer with a wood block in-between so as to determine
whether the suspended springs are out of balance or being seized
To find the sources of noise, press the vibration spot with your hand while the refrigerator is in
operation and listen attentively whether the vibration becomes weake or vanishes. If the refrigerator
has not been levelly placed, put a level meter on its top table and adjust the leveling screws on its
legs .In case noise occurs from the compressor, strike different locations on the side surface of its
case using a rubber hammer or hand hammer with a wood block in-between so as to determine
whether the suspended springs are out of balance or being seized
ERROR CODE ON CONTROL PANEL
Analyses:
User may have changed the original preset parameters of the refrigerator. So the parameters of the refrigerator
Chamber have been increased. It means the parameters are now out of the Adjustable Range.
Pressing the Number Keys can change the original preset parameters. Contents and Range are as below:
User may have changed the original preset parameters of the refrigerator. So the parameters of the refrigerator
Chamber have been increased. It means the parameters are now out of the Adjustable Range.
Pressing the Number Keys can change the original preset parameters. Contents and Range are as below:
Display on
Panel
Panel
Meanings of the Display
Original
preset
parameters
preset
parameters
Adjustable
Range
for
parameters
C1
Fridge Chamber parameters
(on)
(on)
4
-30~30
C2
Fridge Chamber parameters
(off)
(off)
12
2~31
d1
Freezer Chamber parameters
(on)
(on)
-1
-30~30
d2
Freezer Chamber parameters
(off)
(off)
5
2~31
So if user changes the original preset parameters, and these parameters are out of the effective range, the
refrigerator chamber will not work as normal. And if you change the parameters into the adjustable range (see
above sheet), the machine will return to work.
Meanings of Error Code:
Error Code
1
E0 in Fridge area on
display
display
Sensor fault in Fridge
chamber
chamber
2
E0 in Freezer area on
display
display
Sensor fault in Freezer
chamber
chamber
3
E1 in Freezer area on
display
display
Evaporator’s Sensor fault
in Freezer chamber
in Freezer chamber
4
EC
Communication failures
5
E0 E1 E2
Sensor
fault
and
Evaporator’s Sensor fault
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