PB Heat Peerless Boilers GM Series, Installation, Operation & Maintenance Manual

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TROUBLESHOOTING
Table 9.1: Boiler Troubleshooting Guide
PROBLEM POSSIBLE CAUSE CORRECTIVE ACTION
Burners not funcitoning
.
1. No power.
2. Limit not working.
3. Flame rollout switch open.
4. Blocked vent switch open.
5. Gas off at boiler gas valve.
6. Gas off external to boiler.
7. Plugged orifice spuds.
8. Defective gas valve.
9. Improper wiring.
10. Vent damper malfunctioning.
1. Check line voltage wiring and fuses.
2. Check wiring and contacts, relay, temperature setting.
Clean and adjust as necessary.
3. Replace switch. Locate cause and correct.
4. Reset blocked vent switch. Locate cause and
correct.
5. Start boiler using Operating Instructions.
6. Check any gas valves in the line.
7. Check, clean and re-install.
8. Use Figure 9.1 to troubleshoot intermittent ignition
gas valve. Replace if necessary.
9. Check and correct in accordance with wiring
diagrams in Section 6.
10. Refer to vent damper manufacturer’s instructions.
Replace if necessary.
Burners will not shut
down.
1. Defective gas valve.
2. Short circuit.
1. Use Figure 9.1 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.
6. Excessive downdraft or draft problems in
boiler room.
1. Adjust to proper pressure.
2. Install correct spuds.
3. Replace valve.
4. Remove burrs.
5. Contact gas supplier.
6. Check air supply, ventilation and venting system.
Delayed ignition. 1. Insufficient pilot flame.
2. Pilot burner/orifice clogged.
3. Overfiring.
4. Misaligned burners or pilot.
5. Draft problem in boiler room.
1. Increase pilot gas flow.
2. Clean pilot burner and orifice.
3. Reduce rate to input on rating label.
4. Realign burners or pilot.
5. Check air supply, ventilation and venting
system.
Excessive condensation
in vent.
1. Underfiring.
2. Limit set too low.
3. Vent pipe too long.
4. Inadequate chimney or venting system.
1. Increase rate to input on rating label.
2. Reset limit to higher setting.
3. Reposition boiler to reduce length.
4. Check chimney and venting recommendations.
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. Obstructed chimney.
4. Obstructed flueways or vent.
5. Undersized chimney or vent, high draft loss
in vent.
6. Draft problem in boiler room.
7. Overfiring.
8. Vent damper malfunctioning.
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 National Fuel Gas Code ANSI Z223.1/NFPA
54 and/or CAN/CGA B149 Installation Codes and
vent manufacturer’s recommendations.
6. Check air supply, ventilation and venting system.
7. Reduce rate to input on rating label.
8. Refer to vent damper manufacturer’s instructions.
Replace if necessary.