Service Procedures
©2012 Viking Preferred Service 37
ALARMS
There are ve alarms that signify faulty conditions,
they will each be covered in detail.
1. High Temp Alarm
Freezer High Temp alarm
When the freezer temperature reaches the high temp
level (15
o
F) ,set in the EEPROM at factory, for a
predetermined time (3 hours), also set in EEPROM,
the "HIGH TEMP" indicator will come on and the
"FREEZER" indicator will ash. 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 rst
occurs, press and release "ALARM OFF", this will
result in shutting off the audible alarm only. To clear
the "HIGH TEMP" and ashing zone light (FREEZER
), 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 ashing.
2. Open Thermistor Alarm
The controller will sense an open thermistor condition
within 15 seconds of power on.
Open Freezer Thermistor Alarm
When the control senses that the units' thermistor
is open, "oPn" is displayed on the control along
with the zone, "FREEZER". If the control was in
the Refrigerator zone when the condition occurred,
it automatically switches over to the faulty zone
("FREEZER"). You also receive an audible alarm
consisting of ve 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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