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INSTALLATION AND OPERATING INSTRUCTIONS
10. TROUBLESHOOTING – SERVICE TIPS
Problem
Possible Cause
Suggested Remedy
Pilot Outage
Heavy Draft Blowing across Pilot
Redirect Air Movement or Eliminate
Plugged Pilot Orifice
Replace Orifice
No Gas
Check Manual Pilot Valve
Check Main Gas Shut-Off Valve
Check Manual Meter Valve
Consult Gas Company
Ignition Control Problem
See Table 10.2 and Figure 10.1
Main Gas Valve Will Not Open
No Power
Check Power Source with Meter
Check Fuses
Defective Gas Valve
Replace
Low Water Level in Boiler or System Causing Low
Water Cut-off to Function
Check for Leaks
Check Feeder (if Supplied)
Ignition Control Problem
See Table 10.2 and Figure 10.1
High Gas Pressure Switch Open
(if Provided)
Check Switch Setting
Check Manifold Gas Pressure
Low Gas Pressure Switch Open
(if Provided)
Check Switch Setting
Check Manifold Gas Pressure
Burner(s) Burning with Yellow Flame
Air Adjustment Screws Turned in Too Far
Adjust Screws Out
Low Gas Pressure in Manifold
(Insufficient Air Injection)
Adjust Main Gas Pressure Regulator
or Check Line Pressure
Burner Ports Partially Closed
(Rust, Dirt, Lint, etc)
Replace Burners or Clean Ports
Insufficient Air for Combustion
Check Size of Combustion Air Openings
to 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
Gas Spillage from
Draft Hood Relief Opening
Insufficient Draft - Chimney Too Low
Increase Height or Add Induced Draft Fan
Insufficient Draft - Chimney Too Small
Replace Chimney or Add Induced Draft Fan
Insufficient Draft - Blockage in Chimney or Vent
Repair Chimney or Vent
Insufficient Draft - Downdraft Caused by
Chimney Location with Respect to Other
Buildings, Roofs, etc.
Install Chimney Cap
Negative Pressure in Boiler Room
(Due to Exhaust Fan or Duct System)
Remove Exhaust Fan or
Isolate Fan From Boiler Room
Insufficient Combustion Air Openings
Provide Correctly Sized Combustion and
Ventilation Air Openings
Main Gas Valve Opens
But No Gas Flows
Manual Valve Closed at Gas Train
Open Valve
Manual Valve Closed at Meter
Open Valve
Test Firing Valve Closed (if Provided)
Open Valve
Table 10.1: Boiler Troubleshooting
