PB DE-03, Installation, Operation & Maintenance Manual

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TROUBLESHOOTING
Table 8.2: Boiler Troubleshooting Guide (Burners Functioning)
Problem Possible Causes Corrective Actions
Burners not functioning,
blower running. 1. Flame rollout switch open.
2. Pressure switch in closed position.
3. Ignition system problem.
1. Replace switch. Locate cause and correct.
2a. Check for plugged or damaged switch tubing.
2b. See Section “Measuring Suction Pressure” in boiler manual.
If adequate, replace pressure switch. If inadequate, check
for blockage or leak in vent system. If ok, replace blower.
3a. See ignition system troubleshooting guide below.
3b. See ignition system manufacturer literature for instructions
including key to control LED lamp diagnostics.
Burners not functioning,
blower not running. 1. No power.
2. Water Temperature below calculated setpoint
minus differential.
3. Limit Control not working.
1. Check line voltage wiring and fuses.
2a. Wait for calculated setpoint to rise / boiler temperature
to fall.
2b. Adjust efficiency/economy setting. See limit control
manufacturer’s literature.
3. Check wiring and contacts, relay, temperature setting.
Clean and adjust as necessary.
Burners will not shut
down. 1. Defective gas valve.
2. Short circuit.
1. See ignition system troubleshooting guide below
to troubleshoot 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. Draft problems in boiler room. 1. Adjust to proper pressure.
2. Install correct spuds.
3. Replace valve.
4. Remove burrs.
5. Contact gas supplier if natural gas.
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.
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 Aquastat 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 flueways or vent.
4. Draft problem in boiler room.
5. Overfiring. 1. Locate and repair or replace.
2. Shut down boiler and notify gas provider.
3. Clean flueways or vent and remove obstructions.
4. Check air supply, ventilation and venting system.
5. Reduce rate to input on rating label.