Norcold N81X User Manual
www.norcold.com/cda
20
Refrigerator Service Manual
N6XX/N8XX Models
Before beginning this procedure:
■
Make sure lamp/thermistor assembly is connected to wire harness.
Temp
Setting
Flashing
N64X/N84X
N62X/N82X
LP GAS
AC
AUTO
Temp
Setting
Flashing
ON
GAS
Flashing once every 3 seconds
Models and fault indicator displayed.
Thermistor
Lamp
Connection
Thermistor
Connections
Clean/repair terminals or connector as
required. See Figure A.
required. See Figure A.
NO
Check thermistor resistance.
See Figure B and procedure below.
See Figure B and procedure below.
Wires and
connector
connector
good?
Check lamp/thermistor wire
assembly and connector for
dirty/broken connections.
assembly and connector for
dirty/broken connections.
YES
Thermistor packed in ice bath
MIN MAX
RANGE
HOLD
H
Hz
REL
mA
A
mV
V
V
OFF
!
!
A
COM
V
mA
µA
1000V MAX
400mA MAX
FUSED
10A MAX
FUSED
FUSED
PEAK MIN MAX
µA
CAT II
4 1/2 DIGITS
1 Seconds
87
TRUE RMS MULTIMETER
III
Temperature*
Resistance*
(
o
F)
(k )
85
8.1– 9.0
80
9.1–10.0
75
10.1–11.0
70
11.1–12.0
60
12.1–13.0
50
15.5–16.5
40
22.5–23.5
35 24.5–25.5
33 28.5–29.5
32
30.0–32.0
*
Approximate Values
N61X/N81X
Thermistor Failure Fault – Controls in backup operating system mode
Backup Operating System (BOS)
The backup operating system (BOS) is an
electronically controlled duty cycle that maintains the
refrigerator in operation if the thermistor is
disconnected or fails. The BOS maintains cooling by
timing the length of time the heat source is energized.
When the refrigerator is operating in BOS, the length
of the cooling cycle has to be regulated manually
using the TEMP switchbutton.
electronically controlled duty cycle that maintains the
refrigerator in operation if the thermistor is
disconnected or fails. The BOS maintains cooling by
timing the length of time the heat source is energized.
When the refrigerator is operating in BOS, the length
of the cooling cycle has to be regulated manually
using the TEMP switchbutton.
When a colder temperature is desired, changing the
temperature setting to a higher number provides
additional cooling by lengthening the cooling cycle.
For example, if the temperature setting is set to 5,
raising the setting to 6 will lengthen the cooling cycle.
temperature setting to a higher number provides
additional cooling by lengthening the cooling cycle.
For example, if the temperature setting is set to 5,
raising the setting to 6 will lengthen the cooling cycle.
When a warmer temperature is desired, changing the
temperature setting to a lower number shortens the
cooling cycle. For example, if the temperature setting
is set to 6, lowering the setting to 5 will shorten the
cooling cycle.
temperature setting to a lower number shortens the
cooling cycle. For example, if the temperature setting
is set to 6, lowering the setting to 5 will shorten the
cooling cycle.
N61X/N81X Backup Operation.
When the N61X/N81X controls shift to BOS operation,
the ON LED (green) flashes once every three seconds.
When the N61X/N81X controls shift to BOS operation,
the ON LED (green) flashes once every three seconds.
N62X/N82XN64X/N84X Backup Operation
When the N62X/N82XN64X/N84X controls shift to BOS
operation, the temperature setting flashes for ten
seconds when the TEMP button is pressed. After ten
seconds, the selected operation mode indicator
displays.
When the N62X/N82XN64X/N84X controls shift to BOS
operation, the temperature setting flashes for ten
seconds when the TEMP button is pressed. After ten
seconds, the selected operation mode indicator
displays.
Figure A.
Figure B.