Common Gas Burner Problems & Troubleshooting

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Common Gas Burner Problems and Solutions

  1. No Heat
  2. Insufficient heat
  3. Excessive fuel consumption
  4. Pilot does not light or does not stay lit
  5. Pilot lights but burner does not ignite
  6. Pilot flame flickers
  7. Exploding sound when burner ignites
  8. Burner takes more than a few seconds to ignite
  9. Burner flame uneven
  10. Burner flame too yellow
  11. Noisy furnace: rumbling when burners off
  12. Noisy furnace: rumbling when burners on

No Heat

Possible CauseProcedure
No power to systemReplace fuse or reset circuit breaker
Transformer faultyTest transformer and replace if necessary
Pilot light outRelight pilot
Combination control faultyCall for service
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Insufficient heat

Possible CauseProcedure
Air shutter needs adjustmentAdjust burner air shutter
Burner ports cloggedClean burner ports
Gas pressure too lowCall for service
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Excessive fuel consumption

Possible CauseProcedure
Pilot set too highAdjust pilot
Gass pressure too highCall for service
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Pilot does not light or does not stay lit

Possible CauseProcedure
Pilot orifice dirty or cloggedClean pilot
Thermocouple loose or faultyTest thermocouple. Tighten or replace if necessary
Electric pilot faultyCall for service
Combination control faultyCall for service
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Pilot lights but burner does not ignite

Possible CauseProcedure
Gas pressure too lowCall for service
Combination control faultyCall for service
Transformer faultyTest transformer and replace if necessary
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Pilot flame flickers

Possible CauseProcedure
Pilot set too low or too highAdjust pilot
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Exploding sound when burner ignites

Possible CauseProcedure
Pilot set too lowAdjust pilot
Pilot orifice dirty or cloggedClean pilot
Gas pressure too low or too highCall for service
Pilot light not positioned correctlyCall for service
Burner ports cloggedClean burner ports
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Burner takes more than a few seconds to ignite

Possible CauseProcedure
Burner ports cloggedClean burner ports
Pilot needs adjustmentAdjust pilot
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Burner flame uneven

Possible CauseProcedure
Burner ports cloggedClean burner ports
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Burner flame too yellow

Possible CauseProcedure
Burner dirtyClean burner
Insufficient air for combustionProvide air from outside by opening vents in furnace room
If problem persists, call for service
Air shutter opening too smallAdjust air shutter
Burners faultyCall for service
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Noisy furnace: rumbling when burners off

Possible CauseProcedure
Pilot needs adjustmentAdjust pilot
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Noisy furnace: rumbling when burners on

Possible CauseProcedure
Burner ports cloggedClean burner ports
Air shutter needs adjustmentAdjust burner air shutter
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