Viking VUAR140 Troubleshooting Guide download pdf (Page 75)

Component Description Test Procedures

Switch, showroom ON position completes circuit to Check resistance at test points.

lights and display only. Showroom operation—E3 at high voltage board to pin

3 (blue/white wire) at high voltage wire harness.

OFF position completes circuit

for normal operation. Unit run—E9 at high voltage board to pin 3 (blue/white

wire) at high voltage wire harness.

Unit shipped with switch in OFF

position.

Thermistor Senses temperature within Check resistance across terminals. See Technical Data

Refrigerator and freezer.

Sheet for bell curve resistance chart at given

temperatures.

Thermostat Thermostat is in a serried circuit With power off and evaporator coil below freezing,

with high voltage board and thermostat should check continuous when checked with

defrost heater. ohmmeter . See “Heater, evaporator (defrost)” section

for additional tests.

Controls the circuit through

defrost terminator to defrost

heater. Opens and breaks

circuit when thermostat senses

high temperatures.

After defrost thermostat opens,

thermostat remains open until

end of defrost cycle and refrig-

erator starts cooling again.

when defrost thermostat senses

a preset low temperature and

closes.

Valve, water Controls water flow to the ice Check resistance across coil windings. See Technical

maker. Data Sheet for valves for model being serviced.

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Viking VUAR140 Troubleshooting Guide Page 75