Smith GBX 70 - User Manual

Questions and Answers

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Joseph AlvaradoAug 15, 2025
What to do if my Smith GBX 70 Boiler is not heating properly?
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  Ann RamosAug 15, 2025
  If your Smith Boiler isn't heating properly, several factors could be responsible. Underfiring could be the issue, so increase the rate to the input specified on the rating label. A limit set too low can also cause this problem, so reset the Aquastat to a higher setting. Air in the system can impede heating, so vent air from all points in the system. A malfunctioning circulator could be the cause; check it and replace it if necessary. A clogged circulation system can also prevent proper heating, so shut down and cool the boiler, then drain and flush the system. Finally, an incorrect thermostat heat anticipator setting can affect heating performance, so adjust the heat anticipator accordingly.
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Nicholas HarrisonAug 20, 2025
Why is there flashback or burning at the orifice spuds on my Smith Boiler?
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  Linda JohnsonAug 20, 2025
  If you're experiencing flashback or burning at the orifice spuds of your Smith Boiler, it could be due to several reasons. The manifold gas pressure might be too low, so adjust it to the proper pressure. The orifice spuds could be improperly sized or drilled, so install the correct spuds. A leaking gas valve could also be the problem, so replace the valve. Burrs on the orifice can cause issues, so remove them. Low supply gas pressure can also lead to flashback; contact your gas supplier if it's natural gas, or adjust the regulator if it's LP gas. Lastly, excessive downdraft or draft problems in the boiler room could be the cause, so check the air supply, ventilation, and venting system.
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Paige EvansAug 25, 2025
Why is there excessive condensation in the vent of my Smith Boiler?
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  Teresa AveryAug 25, 2025
  Excessive condensation in the vent of your Smith Boiler can stem from a few issues. Underfiring could be the culprit, so increase the rate to the input specified on the rating label. A limit (Aquastat) set too low can also cause this, so reset the Aquastat to a higher setting. If the vent pipe is too long, reposition the boiler to reduce its length. Finally, an inadequate chimney or venting system could be the problem, so check the chimney and venting recommendations.
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Mark SmithAug 29, 2025
Why does my Smith GBX 70 Boiler have delayed ignition?
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  Darryl PhillipsAug 29, 2025
  If your Smith Boiler experiences delayed ignition, consider these potential causes: an insufficient pilot flame, which can be resolved by increasing the pilot gas flow; a clogged pilot burner/orifice, requiring cleaning of both components; overfiring, which necessitates reducing the rate to the input specified on the rating label; misaligned burners or pilot, so realign them. Lastly, a draft problem in the boiler room could be the cause, so check the air supply, ventilation, and venting system.
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Linda MayoSep 2, 2025
What to do if the burners will not shut down on my Smith Boiler?
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  Eric WilsonSep 2, 2025
  If the burners on your Smith Boiler won't shut down, it could be due to a defective gas valve; troubleshoot using Figure 8.1 or replace if necessary. Alternatively, a short circuit could be the cause, so check and correct the wiring.
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Juan FordNov 6, 2025
How to fix burners not functioning on my Smith GBX 70 Boiler?
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  Dawn NguyenNov 6, 2025
  If the burners on your Smith Boiler aren't functioning, there could be several reasons. First, check the line voltage wiring and fuses to ensure there is power. If power isn't the issue, examine the limit (Aquastat) for any wiring or contact problems; also check the relay and temperature setting, cleaning and adjusting as needed. An open flame rollout switch or blocked vent switch could also be the cause; replace or reset them, respectively, after locating and correcting the underlying issue. Ensure the gas is on at the boiler gas valve, and also check any external gas valves. Plugged orifice spuds can prevent ignition, so inspect, clean, and reinstall them. A defective gas valve may also be the culprit; troubleshoot using Figure 8.1 or replace it if necessary. Improper wiring can also cau...
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Karen ManningNov 10, 2025
Why do I smell fumes or gas odors from my Smith Boiler?
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  cesar16Nov 11, 2025
  If you notice fumes or gas odors coming from your Smith Boiler, there are several potential causes. Leaks in the gas piping or fittings could be the source, so locate and repair or replace any faulty components. Leaks in the gas service line or meter could also be to blame, in which case you should shut down the boiler and notify your gas provider immediately. An obstructed chimney or flueways/vent can cause fumes to back up, so check, repair, and/or clean the chimney, flueways, and vent to remove any obstructions. An undersized chimney or vent, or high draft loss in the vent, could also be contributing to the problem; check the National Fuel Gas Code and vent manufacturer’s recommendations. A draft problem in the boiler room, overfiring, or a malfunctioning vent damper can also cause fume...