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TROUBLESHOOTING – SERVICE TIPS
13. TROUBLESHOOTING – SERVICE TIPS
Problem Possible Cause Suggested Remedy
Defective Thermocouple Replace
Heavy Draft Blowing across Pilot Redirect Air Movement or Eliminate
Plugged Pilot Orifice Replace Orifice
Pilot Outage Check Manual Pilot Valve
Check Main Gas Shut-Off Valve
No Gas
Check Manual Meter Valve
Consult Gas Company
Defective Thermopilot Valve Replace
Defective Ignition Control Replace
No Power
Check Power Source with Meter
Check Fuses
Defective Gas Valve Replace
Defective Thermocouple Replace
Low Water Level in Boiler Check for Leaks
Main Gas Valve Will Not Open or System Causing Low Water Cut-off to Function Check Feeder (if Supplied)
(Standard Spark-Ignited Pilot System)
Defective Thermopilot Valve Replace
Defective Ignition Control Replace
High Gas Pressure Switch Open Check Switch Setting
(if Provided) Check Manifold Gas Pressure
Low Gas Pressure Switch Open Check Switch Setting
(if Provided) Check Manifold Gas Pressure
No Power
Check Power Source with Meter
Check Fuses
Defective Gas Valve Replace
Relay Locked Out on Safety Check for Pilot Outage
Pilot Out
Relight Pilot
(May have defective pilot valve or relay)
Main Gas Valve Will Not Open
Defective Relay Replace
(Electronic Standing Pilot System) Low Water in Boiler Check for Leaks
or System Causing Low Water Cut-off to Function Check Feeder (if Supplied)
Defective Thermopilot Valve(s) Replace
Defective Thermocouple(s) Replace
High Gas Pressure Switch Open Check Switch Setting
(if Provided) Check Manifold Gas Pressure
Low Gas Pressure Switch Open Check Switch Setting
(if Provided) Check Inlet Gas Pressure
Air Adjustment Screws Turned in Too Far Adjust Screws Out
Low Gas Pressure in Manifold Adjust Main Gas Pressure Regulator
(Insufficient Air Injection) or Check Line Pressure
Burner Ports Partially Closed (Rust, Dirt, Lint, etc.) Replace Burners or Clean Ports
Burner(s) Burning with Yellow Flame Check Size of Combustion Air Openings to
Insufficient Air for Combustion Room, if Undersized, Correct as Required
Check for Negative Pressure in Boiler Room
Oversized Burner Orifice Install Correct Orifice
High Gas Pressure in Manifold Adjust Main Gas Pressure Regulator
Insufficient Draft – Chimney Too Low Increase Height or Add Induced Draft Fan
Insufficient Draft – Chimney Too Small Replace Chimney or Add Induced Draft Fan
Gas Spillage from
Insufficient Draft – Blockage in Chimney or Vent Repair Chimney or Vent
Insufficient Draft – Downdraft Caused by
Draft Hood Relief Opening
Chimney Location with Respect to Install Chimney Cap
Other Buildings, Roofs, etc.
Negative Pressure in Boiler Room Remove Exhaust Fan
(Due to Exhaust Fan or Duct System) or Isolate Fan From Boiler Room
Insufficient Combustion Air Openings
Provide Correctly Sized Combustion and
Ventilation Air Openings