Dungs VPS 504 Valve Proving System
Dungs VPS 504 Valve Proving System Yellow signal lamp lit: Yellow signal lamp lights up
The burner continues normal operation because the valve proving test passed and the section is tight.
- Code
- Yellow signal lamp lit
- Name
- Yellow signal lamp lights up
- Controller
- Dungs VPS 504 Valve Proving System
- Type
- Gas valve proving
- What it does
- Info
- Risk
- GREEN In your wheelhouse
- Reset
- Clears on its own when the condition goes away
- Source
- The manufacturer's manual (subscribers see which manual and page)
Updated July 23, 2026
How to fix it
Subscribers get:
- What to do next, in plain words
- Which manufacturer manual it comes from, linked
- The 1 common cause listed for this code
- The step by step check for this problem, one check at a time
- Booking a live video call with Ben, a master booth technician ($250/hr, paid per call)
Questions about this code
What does Dungs VPS 504 Valve Proving System Yellow signal lamp lit mean?
The burner continues normal operation because the valve proving test passed and the section is tight.
Is Dungs VPS 504 Valve Proving System Yellow signal lamp lit dangerous?
It is graded green: in a working tech's wheelhouse with standard tools and low risk.
How do I fix Dungs VPS 504 Valve Proving System Yellow signal lamp lit?
The manual's fix and the step by step check for this code are in WERCS Diagnose, plans from $49 a month. For help right now, WERCS answers 24/7 at (877) 489-3727.
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