Viking Quiet Cool VCRB5301, Service Manual

Page: 36 / 47

To avoid risk of electrical shock, personal injury, or death, disconnect electrical power source to unit, unless test
procedures require power to be connected. Discharge capacitor through a resistor before attempting to service.
Ensure all ground wires are connected before certifying unit as repaired and/or operational.
WARNING !
Troubleshooting
36 ©2012 Viking Preferred Service
Code Compressor
Status
Possible Fault Service Action
1 Flash
(every 15
seconds)
ON 1. No failure
detected
• If system is not working properly, check other refrigeration
components.
OFF 1. No signal
from control
board
2. Open
Thermistor
• If refrigerator settings (thermistor conditions) are at levels
in which the compressor should be “ON”.
• Unplug inverter from power supply and wait for 2
minutes, reconnect the inverter to the power supply
and wait for 12 minutes.
• If inverter still shows 1 flash code and compressor is
OFF, then check the control board.
2 Flashes
(every 5 sec-
onds)
OFF 1. No signal
from the con-
trol board
• Check frequency cable connection
• If frequency cable connection is good , replace
inverter.
3 Flashes
(every 5 sec-
onds)
OFF 1. Compressor
/ inverter cable
open circuit
2. Compressor
winding open
circuit
• Check compressor/inverter cable connection
• Check compressor winding resistances (among the 3
terminal hermetic pins)
• If resistances are within specifications and
compressor/inverter cable is OK, replace inverter.
4 Flashes
(every 5 sec-
onds)
OFF 1. Compressor
damaged /
system
damaged
• Check compressor input power
• Check compressor winding resistances
• Check leakage current between hermetic terminal
pins and compressor shell.
• If resistance or leakage current is out of spec, replace
the compressor.
• If resistance and leakage current are within spec,
check inverter/compressor cable for open circuit.
• Unplug inverter from power supply and wait for 2
minutes, reconnect the inverter to the power supply
and wait for 12 minutes.
• If inverter still shows 4 flash code and compressor is
OFF, replace the compressor.
No Flash OFF 1. No input
power
2. Inverter
damaged
• Check the input power (115V)
• If there is no signal, check input power connections
• If voltage is within specs, unplug inverter from power
supply and wait for 2 minutes, reconnect the inverter to
the power supply and wait for 12 minutes.
• If inverter still shows no flash code and compressor is
OFF, change the inverter.
• If the inverter shows no flash code and the compressor is
ON, diagnostic function is not working properly.
VCC3 Inverter Diagnostic Codes