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TROUBLESHOOTING
Table 8.2: Boiler Troubleshooting Guide (Burners Functioning)
Problem Possible Causes Corrective Actions
1. See Figure 8.2
Burners not functioning.
1. See Figure 8.2
1. Defective gas valve.
2. Short circuit.
Burners will not shut
down.
1. Use Figure 8.2 to troubleshoot intermittent
ignition gas valve. Replace if necessary.
2. Check and correct wiring.
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.
Flashback or burning
at orifice spuds.
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.
1. Insufficient pilot flame.
2. Pilot burner/orifice clogged.
3. Overfiring.
4. Misaligned burners or pilot.
Delayed ignition.
1. Increase pilot gas flow.
2. Clean pilot burner and orifice.
3. Reduce rate to input on rating label.
4. Realign burners or pilot.
1. Vent pipe not sloped towards vent terminal.
Condensation at boiler
vent connector/fan.
1. Install condensate trap per vent manufacturer’s
. instructions.
2. Slope vent pipe towards vent terminal.
1. Underfiring.
2. Limit set too low.
3. Air in system.
4. Circulator malfunctioning.
5. Circulation system clogged.
6. Incorrect thermostat heat anticipator setting.
Boiler not heating
properly.
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 to 0.2 Amp.
1. Leaks in gas piping or fittings.
2. Leaks in gas service line or meter.
3. Obstructed chimney.
4. Obstructed flueways or vent.
5. Draft problem in boiler room.
6. Overfiring.
Fumes or gas odors
1. Locate and repair or replace.
2. Shut down boiler and notify gas provider.
3. Check, repair and/or clean chimney.
4. Clean flueways or vent and remove obstructions.
5. Check air supply, ventilation and venting system.
7. Reduce rate to input on rating label.