Trouble Shooting Guide - Viking VGR30 Service Manual

TROUBLE SHOOTING GUIDE

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