Warning Alarm; Resetting The Alarms; Show Room Mode; Error Code Detection - Viking DFRD144 Service Manual

Warning Alarm

The Tru Protect™ system will inform you if the unit is not
functioning properly. It provides both visual and audible
alerts if the temperature rises above or falls below the
set temperature, if there is a power failure, or if the door
is left ajar.
1. Door Ajar: If the door is left open for more than five
(5) minutes, an audible alarm will sound three (3)
times every 30 seconds and the LED light will flash
green. This will stop as soon as the door is closed.
2. High and Low Temperature: If the unit reaches a
temperature either above or below the set point
temperature for more than one (1) hour, an audible
alarm will sound six (6) times every minute and the
LED will flash red. This will continue until the alarm
is reset. The alarm may occur when changing set-
points in excess of 10 degrees F and/or high usage
which is normal.
3. Power Failure: If the unit experiences a power
failure, the LED will flash amber. This will continue
until the alarm is reset. With a power failure, no
audible signal is heard. The alarm may occur upon
initial installation which is normal since the unit was
run at the factory to verify quality.

Resetting the Alarms

Close door to reset Door Ajar alarm. Press the "ON/
OFF" button for approximately one (1) second to reset
all other audible and display alarms.
NOTE: Although pressing the "ON/OFF" button will
reset the alarms, the alarm will resume if the
"alarm condition" still exists.

Show Room Mode

Show Room Mode is used mainly by salespersons and
distributors. When the unit is in Show Room Mode, it will
operate as if functioning normally; however, the internal
components will not run.
Enabling Show Room Mode:
To enable Show Room Mode, press and hold the "ON/
OFF" button while performing a "Power On Reset"
(POR), i.e. - disconnect and reconnect the power supply
to the unit. When Show Room Mode is enabled, the
compressor, condenser fan, internal fan(s), heater,
reverse gas solenoid, and alarms are disabled. The
display will show the last set point entered.
Disabling Show Room Mode:
To exit Show Room Mode, initiate a "Power On Reset"
(POR) only.
© Viking Range Corporation
Diagnostic Information

Error Code Detection

The microprocessor in the control continually monitors
critical refrigeration system components for proper
operation. If component parameters exceed normal
operating specifications, an audible alarm will sound six
(6) times every minute and the display will automatically
flash the respective error code. If multiple errors are
noted with the unit, the error codes will be displayed
sequentially. See chart below for respective error codes
descriptions and the potential causes of failure.

Error Code Detection Reference

Error Code
E1
E2
E3
E4
Resetting Error Codes:
Error Codes can only be reset by disconnecting and
reconnecting the power supply to the unit.
SMR-0003
Error Code Reference Potential Causes of
Failure
1. Compressor wires
disconnected.
2. Faulty compressor.
Compressor fault (high/ 3. Faulty control.
low amps)
4. Faulty compressor
overload.
5. Faulty compressor
PTC starter.
1. Condenser fan motor
wires disconnected.
Condenser fan motor
2. Faulty condenser fan
fault (high/low amps)
motor.
3. Faulty control.
Evaporator thermistor 1. Disconnected wire
"sensor B" fault (out-of- causing open.
range)
2. Shorted thermistor
Display thermistor
wires.
"sensor A" fault (out-of-
3. Faulty thermistor.
range)
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