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Troubleshooting: Burner starts, but no flame is established
Source
Ignition
Electrodes
Ignition
Transformer
Burner Motor
Troubleshooting: Burner starts and fires, but lock out on safety
Source
Poor Fire
Flame Detector
Primary Control
Troubleshooting: Burner starts and fires, but short cycles (too little heat)
Source
Thermostat
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Procedure
Remove gun assembly and inspect
electrodes and leads.
Connect ignition leads to the
transformer. Start burner and
observe spark. Check line voltage
to transformer primary.
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
excessive drag.
Procedure
After burner fires,
immediately jumper across
flame detector terminals at
the primary control.
S
If burner continues to
run, this may be due to
poor fire. Inspect fire.
S
If fire is good, fault is in
the
flame
detector.
Check detector circuit.
S
If burner locks out on
safety, fault is in the pri-
mary control.
Procedure
Check thermostat.
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Causes
Fouled or shorted electrodes
Dirty electrodes and leads
Eroded electrode tips
Improper electrode gap spacing
Improper position of electrode tips
Bad buss bar connection
Cracked or chipped insulators
Cracked or burned lead insulators
Low line voltage
Burned out transformer windings.
No spark or weak spark
Low line voltage
Pump or blower overloading motor
Faulty motor
Causes
Unbalanced fire
Too much air − −lean short fire
Too little air − − long dirty fire
Excessive draft
Too little draft or restriction
Dirty cad cell face
Faulty cad cell − exceeds 15000 hms
Loose or defective cad cell wires
Primary control circuit defective
Causes
Heat anticipator set too low
Vibration at thermostat
Thermostat in the path of a warm air
draft
Page 21
Correction
Clean electrode leads.
Clean electrode tips and reset the
gap to 5/32 inches and correctly
position tips.
Re−tension and realign.
Replace electrode.
Replace electrode leads.
Check voltage at power source.
Correct cause of voltage drop or call
the power company.
Replace the transformer.
Properly ground the transformer
case.
Check voltage at power source.
Correct cause of voltage drop or the
call power company.
Correct cause of overloading.
Replace motor.
Correction
Replace nozzle
Reduce combustion air − check
combustion.
Increase combustion air − check
combustion.
Adjust barometric damper for correct draft.
Correct draft or remove restriction.
Clean cad cell face.
Replace cad cell.
Secure connections or replace cad cell
holder and wire leads.
Replace primary control.
Correction
Correct heat anticipator setting.
Correct source of vibration.
Shield thermostat from draft or relocate.
table continued on next page
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