Panasonic NR-BN34FX1, Service Manual

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7.4. Operation in case of failure
Failure of magnetic switch (LED Lamp)
In case of failure of magnetic door switch, the LED Lamp stays switched on for 10 minutes, even when door is
closed. During this time the appliance is operating normally and in accordance with the settings.
Failure of Temperature Sensors
Fridge compartment (PC)
Failure of PC sensor in fridge compartment: time algorithm is installed which sets and deletes the request for
cooling of fridge compartment i.e. opening of the PC Damper:
• for 15 minutes the PC Damper is open
• for 30 minutes the PC Damper is closed
When the PC Damper opens, the Fan Motor switches on and when the PC Damper closes, the Fan Motor switches off. Display for
Fridge
temperature displays ''E1''.
Freezer compartment (FC)
Failure of FC sensor in freezer compartment: display shows ''E3''. The request for cooling of freezer
compartment i.e. switch on/off of compressor and Fan Motor is activated in cycles:
• 15 minutes ON.
• 40 minutes OFF.
If the request for Fan Motor operation in one compartment is interrupted and other compartment requires Fan Motor
operation, the Fan Motor functions.
Freezer compartment evaporator
Failure of Defrost sensor on freezer compartment evaporator: start of defrosting according to the prescribed total
time of compressor operation. Defrosting is carried out normally, but the temperature at which the Defrost
heater switches off, is +8°C.
Failure of fridge and freezer compartment Temperature sensor at the same time
In this case the display of temperature in fridge compartment shows "E1" and the display of temperature in
freezer compartment shows "E3".
On models with one-digit temperature display in fridge compartment, "E" and "1" are shown alternately,
with 1-second interval while the regulations function each one in accordance with their time regime.
Alarms
Alarms of too high temperature in fridge/freezer compartment
In case the temperature in fridge compartment e13 ° C and in freezer compartment -9 ° C, the high
temperature alarm will be activated:
• sound alarm is heard, the key for cancellation of alarm is flashing with frequency 1 Hz (0.5 seconds ON and 5
seconds OFF), and on the display, depending on the compartment in which the temperature has raised above
the alarm temperature, the set temperature is flashing.
• Sound alarm is the interrupted buzzer sound: 15 seconds ON and 15 seconds OFF in the first 5 minutes every hour.
• Sound alarm is cancelled by pressing the key for cancellation of the alarm.
• Flashing of key and set temperature remains active until the appliance has cooled down and the temperature
drops below the alarm value.
• If within 24 hours after the cancellation of the sound alarm the appliance does not cool down below the alarm
temperature, the sound alarm is activated again.
Alarm due to power supply failure (blackout) during appliance operation
In case that during a power failure the appliance has heated up to the alarm temperature (+13°C in fridge or -
9°C in freezer compartment), after the restoration of power supply, the alarm of too high temperature is activated.
In case the alarm of too high temperature is activated due to power supply failure, unlike in case of too high
temperature alarm, the number -16 on freezer or +9 on refrigeration display start flashing. In this case the
alarm is active until user’s cancellation.