Viking VGR30, Service Manual

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31
TROUBLE SHOOTING GUIDE
PROBLEM PROBABLE
CAUSE CORRECTION
1. No bake operation in bake 1A. No voltage to thermostat 1A. Check for 120VAC at the thermostat
or broil. terminals BA to Neutral. If no voltage
is present check for broken wiring.
voltage is present check for broken
wiring.
2. No bake operation. Broil
2A. Defective thermostat 2 A. Check thermostat contacts for continuity
operates normally, bake contacts or check for 120VAC at thermostat cont-
ignitor does not glow red. tact BA to Neutral. If no voltage is present or
open contacts indicated, replace the thermostat.
If voltage is present or contacts are closed,
check for broken wiring between thermostat
and ignitor.
Proceed to 2B
2B. Defective Ignitor. 2 B. Check ignitor for continuity. If no contin-
uity is indicated or if ignitor does not glow
when tested, replace the ignitor. If the
ignitor. If the ignitor glows when tested
or indicates continuity, check for broken
wiring between the ignitor and gas valve.
Proceed to 2C.
2C. Open heater coil in gas 2 C. Check gas valve heater coil for continuity
valve. If heater coil is open replace the gas valve
If continuity is indicated, check for broken
wiring between the gas valve and thermostat
3. No broil operation. Bake
3A. Defective thermostat 3 A. Check thermostat contacts for continuity
operates normally. Broil contacts. or check for 120VAC at the thermostat
ignitor does not glow red. contacts BR to Neutral. If no voltage is
present or open contact is indicated, replace
the thermostat. If voltage is present or
the contact is closed, check for broken
wiring between the thermostat and ignitor.
3B. Defective ignitor. 3 B. Check the ignitor for continuity, if no
continuity is indicated or if the ignitor does
not glow when tested, replace the ignitor.
If the ignitor glows when tested or indicated
continuity, check for broken wiring
between the ignitor and gas valve. Proceed
to 3C.
3C. Open heater 3 C. Check the gas valve heater coil for continuity
If the heater coil is open, replace the gas valve.
If continuity is
indicated, check for broken wiring between the
gas valve and thermostat.
4. No gas flow to the burner 4A. Defective ignitor 4 A. Check the ignitor current draw. If less
ignitor glows red. than 3.2 amps, replace the ignitor.
a) Intermittant burner flame 4B. Gas pressure too low 4 B. Check for correct gas pressure, Nat. gas
b) lighting only one side of pressure should be 5” WCP and LP
burner. c) gas odors should be 10” WCP.
d) lowering average temp.
of oven.