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burner Issue

Paint Booth Burner Won't Ignite

A burner that won't ignite stops your entire paint operation. Here's how to diagnose and resolve the issue safely.

Emergency: (877) 489-3727Start Diagnosis

What You're Experiencing

The paint booth or makeup air unit burner is not igniting. The blower may be running but the burner does not light, or the ignition sequence starts but...

Visual Signs:

  • No visible flame through burner sight glass
  • Ignition LED blinking or showing fault code
  • Spark visible but no flame established
  • Burner controller showing lockout status
  • Temperature not rising despite blower running

Sound Signs:

  • Clicking of ignition system attempting to fire
  • Gas valve opening click but no ignition whoosh
  • Continuous purge fan running without burner start
  • Alarm buzzer from control panel

Safety Risks — Read Before Proceeding

critical(NFPA 86 Chapter 8)

Unburned gas accumulation

Action: Do not repeatedly attempt ignition. Allow purge cycle to complete. If you smell gas, evacuate and ventilate.

high(NFPA 86 Section 8.6)

Delayed ignition/flashback

Action: Never bypass safety interlocks. Do not manually light the burner.

medium

Production downtime in cold weather

Action: Do not paint below minimum temperature specifications for your coating system.

Immediate Steps to Take

  1. 1

    Check the burner controller for fault codes or lockout status

  2. 2

    Verify the manual gas shutoff valve is fully open

  3. 3

    Confirm the blower is running and airflow switch is satisfied

  4. 4

    Allow one reset attempt per manufacturer instructions

  5. 5

    Check gas supply pressure at the unit (if gauge equipped)

  6. 6

    Inspect the igniter through the sight glass for spark or glow

  7. 7

    Do not attempt more than 2-3 ignition cycles without diagnosis

Common Causes

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

Dirty or Failed Igniter

common

The spark igniter or hot surface igniter is fouled with combustion residue, cracked, or has failed. Igniters wear out over time and need periodic replacement.

Flame Sensor Issue

common

The flame rod or UV flame sensor is dirty, mispositioned, or failed. Even if the burner lights momentarily, a faulty sensor causes immediate shutdown.

Gas Supply Problem

common

Insufficient gas pressure, closed manual valve, or gas supply interruption. The burner cannot ignite without proper fuel supply.

Airflow Switch Not Satisfied

occasional

The combustion airflow proving switch is not detecting adequate airflow, preventing ignition as a safety measure.

Gas Valve Failure

occasional

The main gas valve or pilot gas valve has failed electrically or mechanically and is not opening to allow gas flow.

Control Board Failure

rare

The burner control module or ignition control board has failed and is not executing the ignition sequence properly.

Interactive Diagnostic Tool

Burner Ignition Failure Diagnostic

Step 1 of 5

Is the burner controller showing a fault code or lockout?

If unsafe at any point: If you smell gas accumulating or the situation seems unsafe, shut off the manual gas valve, evacuate the area, and call WERCS emergency line at (877) 489-3727.

When to Call WERCS

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

  • Burner won't ignite after one reset attempt
  • You see spark but no flame establishes
  • Burner lights then immediately goes out
  • Controller shows repeated fault codes
  • You smell gas or suspect a leak
  • You need emergency heating restoration

Priority Service Available

(877) 489-3727

Expert technicians nationwide

Paint Booth Burner Won't Ignite FAQ

Common questions about this issue

Limit restart attempts to 2-3 cycles maximum. Each failed ignition cycle releases unburned gas into the combustion chamber. Repeated attempts increase the risk of delayed ignition (a small explosion when accumulated gas finally ignites). If the burner doesn't light after 2-3 attempts, stop and call for service.
Spark with no flame indicates the ignition system is working but gas isn't reaching the burner or isn't at the right pressure. Check that the manual gas valve is open, gas supply is active, and pilot/main gas valves are operating. Low gas pressure can also prevent ignition.
Never manually light an industrial burner. These systems have specific safety sequences including pre-purge, proven pilot, and flame supervision. Bypassing these safeguards can result in explosion or fire. Always use the automated ignition system.
Hot surface igniters typically last 3-5 years depending on usage. Spark igniters may last longer but electrodes wear and gap increases. Include igniter inspection in annual maintenance. Replace proactively if showing wear signs—it's inexpensive insurance against downtime.

Have a question not answered here?

Call us at (877) 489-3727

Related Problems

Flame FailureNot HeatingGas Valve Problems

Related Parts & Components

Ignition ModuleFlame SensorGas Valve

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