Paint Booth Filters Now AvailableGet Your Quote
burner IssueEmergency

Gas Valve Issues

Gas valves are critical safety components. When they fail, the booth will not operate—by design.

Emergency: (877) 489-3727Start Diagnosis

What You're Experiencing

The gas valve on the paint booth burner is not functioning properly. The burner may fail to ignite because the valve won't open, or the valve may be leaking, sticking, or not closing completely when the burner should be off.

Visual Signs:

  • Burner controller shows gas valve fault
  • No flame despite igniter functioning
  • Pilot lights but main valve doesn't open
  • Valve position indicator shows incorrect state
  • Gas odor when burner should be off

Sound Signs:

  • No click from gas valve during ignition sequence
  • Weak click indicating partial valve operation
  • Hissing sound from valve area (potential leak)
  • Valve buzzing or chattering

Safety Risks — Read Before Proceeding

critical(NFPA 54 (National Fuel Gas Code))

Gas leak from failed valve

Action: If you smell gas when burner is off, shut off manual gas valve and ventilate. Do not operate any ignition sources.

critical(NFPA 86 Chapter 8)

Uncontrolled gas flow

Action: If valve fails open, excess gas can accumulate. This is why burners have redundant valve trains.

medium

Complete burner failure

Action: Gas valve failure means no heat. Plan for repairs before cold weather or production needs.

Immediate Steps to Take

  1. 1

    Check for fault codes on burner controller indicating gas valve issue

  2. 2

    Verify all safety interlocks are satisfied (airflow, limits, etc.)

  3. 3

    Confirm manual gas shutoff valve is open

  4. 4

    Listen for gas valve click when burner attempts to fire

  5. 5

    Check for gas odor that might indicate a leaking valve

  6. 6

    Do not attempt to manually open or bypass gas valves

  7. 7

    Call for professional service if valve is suspect

Common Causes

Here are the most likely reasons you're experiencing this problem, ranked by how often we see them.

Valve Coil Failure

common

The electromagnetic coil that opens the valve has failed due to age, overheating, or electrical issues.

Control Signal Issue

common

The gas valve is not receiving the electrical signal to open from the burner controller due to wiring or control fault.

Valve Mechanical Failure

occasional

Internal valve components (seat, disc, spring) have failed, preventing proper operation.

Debris in Valve

occasional

Pipe scale, dirt, or debris has entered the valve and is preventing it from seating or opening properly.

Voltage Problem

occasional

Incorrect voltage to the valve coil (24V vs 120V mismatch, low voltage) preventing proper operation.

Safety Interlock Preventing Open

occasional

A safety interlock (airflow, high limit, flame safeguard) is not satisfied, so the valve is correctly being held closed.

Interactive Diagnostic Tool

Gas Valve Diagnostic

Step 1 of 5

Do you smell gas when the burner is OFF?

If unsafe at any point: If you detect gas leaks or smell gas accumulation, shut off the main gas supply, evacuate, and call WERCS emergency at (877) 489-3727.

When to Call WERCS

While some issues can be resolved with basic troubleshooting, these situations require professional service:

  • Gas valve is not opening when commanded
  • You smell gas when the burner is off (possible leak)
  • Valve is making unusual sounds (buzzing, chattering)
  • Controller shows gas valve fault code
  • You suspect valve needs replacement
  • Any gas-related safety concern

24/7 Emergency Service

(877) 489-3727

Expert technicians nationwide

Gas Valve Issues FAQ

Common questions about this issue

NFPA 86 requires redundant (dual) safety shutoff valves on industrial burners. If one valve fails to close, the other provides backup protection against gas leaks. This redundancy is a critical safety feature—never bypass or remove one of the valves.
Quality gas valves typically last 10-15 years, but this depends on cycle frequency, operating conditions, and maintenance. Valves should be inspected annually and leak-tested. Replace proactively if showing signs of wear or if cycling very frequently.
Gas valves are generally replaced rather than repaired. The cost of a new valve is relatively low compared to the safety risk of a failed repair. Additionally, repaired valves may not carry the same safety certifications as new ones.
Buzzing often indicates incorrect voltage (usually low voltage), a failing coil, or debris preventing the valve from fully opening or closing. A chattering valve is a sign of imminent failure and should be replaced promptly.

Have a question not answered here?

Call us at (877) 489-3727

Related Problems

Burner Not IgnitingFlame FailureNot Heating

Can't Fix It? We Can.

WERCS expert technicians service paint booths and extraction systems nationwide. 24/7 emergency service available.

Call (877) 489-3727Request Service Quote