Spark Module Test; Surface Burner Igniter Will Not Spark; Rtd Characteristics - Viking VGSC530 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.

Spark Module Test

Surface Burner Igniter Will Not Spark

1. Check for and remove any foreign objects/soil
buildup around the igniter and operate burner again.
2. If still inoperative, disconnect power to the range.
3. Remove the control panel from the range.
4. Disconnect the wire harness from the inoperative
spark module.
5. Reconnect power and test for 120 VAC from the
black to the white wire.
6. If 120 VAC is present, disconnect power and
reconnect wire harness. (If no 120 VAC, check
wiring.)
7. Remove the grate, burner cap, and burner head.
8. Disconnect the black wire from the back of the spark
module.
9. Check for 0 ohms between the black wire and the
metal top of the igniter. (If open, replace wire.)
10. If 120 VAC is present in step 5 and the black igniter
wire has continuity, replace the spark module.
24

RTD Characteristics

Proper diagnostics of the RTD (Resistance Temperature
Detector) will eliminate unnecessary replacement.
The RTD is designed to change resistance as the
temperature in the oven cavity changes. As the
temperature increases, so does the resistance. At 75°F,
the resistance should be approximately 1090 Ω.
To test the RTD, locate the 2-Pin Molex connector. For
the RH oven, the connector is located on the control
board. For the LH oven and griddle, the connector is
located on the LH oven or griddle control.
Unplug the connector and check between the yellow
and black wire. At ambient temperature you should
read around 1090 ohms (±10%). An open reading (∞)
indicates either a broken wire or open RTD. Finally, test
each wire to ground to check for a pinched wire to the
oven frame.
If the RTD resistance is within the specifi cations given
it is not necessary to replace the RTD. If the RTD test
resistance is within specifi cations and the consumer
is having erratic oven temperatures, please call Viking
Technical support (1-800-914-4799) for assistance.
RTD (Resistance Temperature Detector)
Temperature (°F)
50
75
100
200
300
350
400
450
500
550
600
650
700
750
800
850
900
Resistance (Approximate)
1038
1090
1143
1350
1553
1654
1754
1852
1950
2047
2153
2238
2332
2425
2518
2609
2700
©2010 Viking Preferred Service