User Guide

Page 28
Troubleshooting: Burner starts, but no flame is established
Source CorrectionCausesProcedure
Ignition
Electrodes
Remove gun assembly and inspect
electrodes and leads
Fouled or shorted electrodes Clean electrode leads.
Electrodes electrodes and leads.
Dirty electrodes and leads
Eroded electrode tips Clean electrode tips and reset the
gap and correct position tips See
Improper electrode gap spacing
gap and correct position tips. See
fi
g
ure 15.
Improper position of electrode tips
figure
15
.
Damaged Transformer Leads Replace Transformer
Cracked or chipped insulators Replace electrode.
Cracked or burned lead insulators Replace electrode leads.
Ignition
Transformer
Connect ignition leads to the
transformer. Start burner and
observe spark. Check line voltage
to transformer primary
Low line voltage Check voltage at power source.
Correct cause of voltage drop or
call the power company.
to transformer primary.
Burned out transformer windings. Replace the transformer.
No spark or weak spark Properly ground the transformer
case.
Burner Motor Motor does not come up to speed
and trips out on overload. Turn off
power and rotate blower wheel by
hand to check for binding or
Low line voltage Check voltage at power source.
Correct cause of voltage drop or
the call power company.
hand to check for binding or
excessive dra
g
.
Pump or blower overloading motor Correct cause of overloading.
excessive
drag
.
Faulty motor Replace motor.
Troubleshooting: Burner starts and fires, but lock out on safety
Source Procedure Causes Correction
Poor Fire After burner fires,
immediately jumper across
Unbalanced fire Replace nozzle
immediately jumper across
flame detector terminals at
the
p
rimar
y
control.
Too much air − −lean short fire Reduce combustion air − check
combustion.
the
primary
control
.
S If burner continues to
run
,
this ma
y
be due to
Too little air − − long dirty fire Increase combustion air − check
combustion.
run
,
this
may
be
due
to
poor fire. Inspect fire.
Excessive draft Adjust barometric damper for correct draft.
pp
Too little draft or restriction Correct draft or remove restriction.
Flame Detector
S If fire is good, fault is in
Dirty cad cell face Clean cad cell face.
g,
the flame detector.
Check detector circuit
Faulty cad cell − exceeds 15000 hms Replace cad cell.
Check detector circuit.
Loose or defective cad cell wires Secure connections or replace cad cell
holder and wire leads.
Primary Control
S If burner locks out on
safety, fault is in the pri-
mary control.
Primary control circuit defective Replace primary control.