Alarms; High Temp Alarm; Open Thermistor Alarm - Viking VCRB5301 Service Manual

ALARMS

There are five alarms that signify faulty conditions,
they will each be covered in detail.

1. High Temp Alarm

Refrigerator High Temp alarm
When the refrigerator temperature reaches the
high temp level (above 50
at factory, for a predetermined time (3 hours), also
set in EEPROM, the "HIGH TEMP" indicator will
come on and the "REFRIGERATOR" indicator will
flash. You will also get a continuous audible alarm,
consisting of a beep pattern (ON - 0.5 sec, OFF 2
sec's).
If the condition(s) change and the units temperature(s)
are brought back within limits as described above,
the audible alarm will turn off. The "HIGH TEMP"
and the appropriate zone (Refrigerator or Freezer)
indicator will continue to operate as described above.
To cancel the audible alarm when condition first
occurs, press and release "ALARM OFF", this
will result in shutting off the audible alarm only.
To clear the "HIGH TEMP" and flashing zone
light (REFRIGERATOR), the temperature must
be brought down below the limit temperature as
described in the appropriate zone above. Then
pressing and releasing "ALARM OFF" once will
clear the "HIGH TEMP" off the screen and the zone
indicator will stop flashing.
©2012 Viking Preferred Service
F) ,set in the EEPROM
o
Service Procedures

2. Open Thermistor Alarm

The controller will sense an open thermistor condition
within 15 seconds of power on.
Open Refrigerator Thermistor Alarm
When the control senses that the refrigerator
thermistor is open, "oPn" is displayed on the control
along with the zone, "REFRIGERATOR". You also
receive an audible alarm consisting of five beeps
that occurs only one time. The visual alarms as
described above will continue until the condition
is corrected.
The unit will continue to execute temperature control
and defrost operations as required until the condition
is corrected. The control does this through software
programming, acting as if the cut-out temperature
is never reached in the faulty zone, temperature
control in the other zone is unaffected.
The visual alarms will reset by themselves within
15 seconds of the open thermistor condition being
corrected and temperature control reverts back to
normal operation.
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