Fulton Boiler FBS Series
FBS 01/05 24
NOTE
A very common problem is that when a boiler cools down, the steam in the steam space
condenses and gradually forms a vacuum. If the feedwater line is open, the boiler will draw in
water in an attempt to equalize the pressure. The appearance in the water level gauges is the
same if they are empty or fully flooded. If the sight glasses appear empty, but the water level
control alarm(s) have not sounded, it is highly probable that the boiler is flooded. Allow air
into the system and drop the water to the normal operating level.
FAULT FINDING TABLE
Problem
Solution
Burner does not start
1. No voltage at program relay power input
terminals.
a. Main disconnect switch open.
b. Blown control circuit fuse.
c. Loose or broken electrical connection.
2. Program relay safety switch requires resetting
3. Limit circuit not completed- no voltage at end
of limit circuit program relay terminal.
a. Pressure or temperature is above setting of
operation control.
b. Water below required level.
c. Fuel pressure must be within setting of low
pressure and light pressure switch.
d. Check burner air proving switch and high
fire limit switch.
e. Heavy oil fired unit-oil temperature below
minimum setting.
4. Fuel valve interlock circuit not completed.
No ignition
1. Lack of spark
a) Electrode grounded or porcelain creaked.
b) Improve electrode setting.
c) Loose terminal on ignition cable.
d) Inoperative ignition transformer.
e) Insufficient at pilot ignition circuit terminal.
2. Spark but not flame
a. Lack of fuel- no gas pressure, closed valve,
empty tank etc.
3. Low fire switch open in low fire proving circuit.
Damper motor not closed, defective switch.
4. Running interlock circuit not completed.
a. Combustion or atomizing air proving
switched defective or not properly set.
b. Motor starter interlock contact not closed.
5. Flame detector defective, sight tube
obstructed, or lens dirty.
6. Check the programmer controller.
Pilot flame, no main flame
1. Insufficient pilot flame.
2. Gas fired unit
a. Manual gas cock closed.
b. Main gas valve inoperative.
c. Gas pressure regulator inoperative.
3. Oil fired unit
a. Oil supply cut off by obstruction, closed
valve, or loss of suction.
b. Supply pump inoperative.
c. No fuel.
d. Main oil valve inoperative.
e. Check oil nozzle, gun and lines.
