Figure 8.1: Measuring Fan Suction Pressure
Table 8.1: Boiler Troubleshooting Guide (Burners Functioning)
PROBLEM POSSIBLE CAUSES CORRECTIVE ACTIONS
Burners not functioning.
See Figure 8.2 See Figure 8.2
Burners will not shut down.
1. Defective gas valve.
2. Short circuit.
1. Use Figure 8.2 to troubleshoot intermittent
ignition gas valve. Replace if necessary.
2. Check and correct wiring.
Flashback or burning
at orifice spuds.
1. Manifold gas pressure too low.
2. Improperly sized/drilled orifice spuds.
3. Leaking gas valve.
4. Burrs on orifice.
5. Low supply gas pressure.
1. Adjust to proper pressure.
2. Install correct spuds.
3. Replace valve.
4. Remove burrs.
5. Contact gas supplier if natural gas. Adjust
regulator if LP gas.
Delayed ignition.
1. Insufficient pilot flame.
2. Pilot burner/orifice clogged.
3. Overfiring.
4. Misaligned burners or pilot.
1. Increase pilot gas flow.
2. Clean pilot burner and orifice.
3. Reduce rate to input on rating label.
4. Realign burners or pilot.
Boiler not heating
properly.
1. Underfiring.
2. Limit set too low.
3. Air in system.
4. Circulator malfunctioning.
5. Circulation system clogged.
6. Incorrect thermostat heat anticipator setting.
1. Increase rate to input on rating label.
2. Reset limit to higher setting.
3. Vent air from all points in system.
4. Check circulator, replace if necessary.
5. Shut down and cool boiler, drain and flush
system.
6. Adjust heat anticipator.
Fumes or gas odors.
1. Leaks in gas piping or fittings.
2. Leaks in gas service line or meter.
3. Leaks in venting system.
4. Overfiring.
1. Locate and repair or replace.
2. Shut down boiler and notify gas provider.
3. Locate and repair or replace.
4. Reduce rate to input on rating label.
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