Troubleshooting; Vcc3 Inverter Diagnostic Codes - Viking VCFB5301 Service Manual

Troubleshooting

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.

VCC3 Inverter Diagnostic Codes

Code Compressor
Status
1 Flash ON
(every 15
seconds)
OFF
2 Flashes OFF
(every 5 sec-
onds)
3 Flashes OFF
(every 5 sec-
onds)
4 Flashes OFF
(every 5 sec-
onds)
No Flash OFF
40
! WARNING
Possible Fault
1. No failure • If system is not working properly, check other refrigeration
detected components.
1. No signal • If refrigerator settings (thermistor conditions) are at levels
from control in which the compressor should be "ON".
board • Unplug inverter from power supply and wait for 2
2. Open minutes, reconnect the inverter to the power supply
Thermistor and wait for 12 minutes.
• If inverter still shows 1 flash code and compressor is
OFF, then check the control board.
1. No signal • Check frequency cable connection
from the con- • If frequency cable connection is good , replace
trol board inverter.
1. Compressor • Check compressor/inverter cable connection
/ inverter cable • Check compressor winding resistances (among the 3
open circuit terminal hermetic pins)
2. Compressor • If resistances are within specifications and
winding open compressor/inverter cable is OK, replace inverter.
circuit
1. Compressor • Check compressor input power
damaged / • Check compressor winding resistances
system • Check leakage current between hermetic terminal
damaged 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.
1. No input • Check the input power (115V)
power • If there is no signal, check input power connections
2. Inverter • If voltage is within specs, unplug inverter from power
damaged 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.
Service Action
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