- Appliance
- Viking professional range oven
- Symptom
- Oven lit sometimes, not others
- Resolution
- Spark plug replaced after meter testing
- Location
- Montlake, Seattle
What the customer reported
The oven was not lighting reliably — the sort of intermittent fault that is easy to misdiagnose without meter readings.
What we found
With the oven open and a meter on the circuit, the spark plug was the component that failed under test. Testing first is what kept this to a single part rather than a guess-and-replace.
What we did
Replaced the spark plug and confirmed ignition from cold across repeated cycles.
Why this happens
Intermittent ignition faults are where parts get replaced unnecessarily. A meter on the circuit answers in minutes what guesswork answers in two visits and three parts.