Service manual

(143)
The next diagnostic step is to turn the unit off
and then remove the high voltage wire from
the igniter. When the unit is turned on you
should hear a sharp clicking sound from the
igniter. If no sound is detected, replace the
igniter. When sound is present the igniter is
good.
(144)
If the igniter checks good and there still is no
spark at the electrode, you must check the
high voltage wire and electrode. Make a visual
check of the high voltage wire for any defects
or broken insulation on the wire that could
allow the high voltage to go to ground. Also,
check the wire that has been disconnected at
each end for continuity.
(145)
The electrode spark gap must be set at three
sixteenths (3/16) of an inch to provide a
proper spark. The spark gap is the distance
between the burner and the tip of the
electrode.
Burne
(146)
You would next check the electrode for any
visual cracks or breaks on the ceramic portion.
If you have a good igniter and high voltage
wire and still do not have spark at the tip of
the electrode, replace the electrode.
A-6-47