Norcold 121X series, Руководство по обслуживанию

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18
S
ection
3
Thermistor Circuit Open or Shorted —Backup Operating System (BOS)
MODE ON/OFF SET TEMP
1 COLD-
9 COLDEST
on
Open or shorted thermistor
This fault is indicated by a blinking
temperature setting. It may be set by:

Intentionally disconnecting the thermistor
from the circuit.

An open thermistor (O.L. indication).

A shorted thermistor (0 resistance).

Broken thermistor wire leads.

Corroded or broken thermistor connectors.
The fault causes the temperature setting
number to blink anytime the TEMP SET
switch button is pressed. After ten seconds
the blinking setting turns off.
Backup operating system (BOS)
BOS is a duty cycle designed to maintain
cooling anytime the thermistor is sensed
open or shorted.
When the refrigerator is operating in BOS,
changing the temperature setting on the
display increases the cooling cycle. For
example, changing the setting from 5 to 6
increases cooling cycle time. Lowering the
setting from 5 to 4 decreases cooling cycle
time.
Begin
Temperature setting flashing?
1
Wires and connections in clean and
in good condition?
2
Thermistor operating as designed.
NO
Check thermistor wires at thermistor and
at connector. See Figure 3-9, page 19.
YES
NO
YES
Clean and repair connections as needed.
Measure thermistor resistance. See
Figure 3-10, page 19. Refer to page 19
Table: Thermistor Resistance Values.
Blinking