Lennox OHR23-105 - Page 21

Page 21
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 to 5/32 inches and
Improper electrode gap
spacing
the gap to 5/32 inches and
correctly position tips.
Improper position of electrode
tips
Bad buss bar connection Retension and realign.
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.
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
excessive drag
Low line voltage Check voltage at power
source. Correct cause of
voltage drop or the call power
company.
excessive drag.
Pump or blower overloading
motor
Correct cause of overloading.
Faulty motor Replace motor.