Viking VGSU103 Service Manual page 12

Troubleshooting Procedures
To avoid risk of electrical shock, personal injury, or death; disconnect power and shut off gas to unit before
servicing, unless testing requires power.
Problem
Burner will not ignite; spark present
at igniter.
Continual sparking after ignition
12
Possible Cause
Low gas pressure..............................
Burner cap not seated correctly or
ports blocked.....................................
Weak or failed spark module............
Improper wiring - spark lead does
not correspond to igniter switch.........
Burner cap not seated correctly or
ports blocked.....................................
Shorted micro switch/harness...........
Switch is not properly seated on
valve stem.........................................
Bad connection to ground..................
Faulty spark lead...............................
SMC-0002
Correction
• Verify pressure of 5" WCP for
natural gas; 10" WCP for liquid
propane
• Verify proper seating and clean
ports
• Replace spark module
• Check all connections against
wiring diagram
• Verify proper seating and clean
ports
• Replace igniter harness.
• Carefully reposition switch on
valve and verify the switch is
functional (see Component
Testing Procedures)
• Verify a clear path to ground.
Clean and dry all metal contact
points along ground path to
ensure continuity
• Test/replace - presence of
spark alone does not indicate a
functional lead
© Viking Range Corporation