A.O. Smith HW 300 Instruction Manual page 36

CHECKING HONEYWELL S8600H OR S-8600M
NO SPARK AT PILOT BURNER BUT PILOT WILL NOT LIGHT
Fix connection and/or
tighten module to the
boiler.
Check the circuit providing
24 VAC.
Replace ignition module.
Turn on gas supply and/or
power supply.
Securely connect cable
and/or ground wire.
Replace pilot burner and/
or ground wire.
Carefully bend down-
wards top of ground
strap to achieve
1/8" spark gap.
Replace ignition module.
INTERMITTENT IGNITION CONTROLS
Turn off gas supply.
NO Is there a good connection between terminals?
Is module securely attached to boiler for good ground
connection?
NO
Is voltage (24VAC) across transformer positive terminal and
GND with "call for heat"?
NO
Is voltage (24VAC) across ignition module terminals 24 Volt and GND on
"call for heater"?
NOTE: (For Propane (LP) models only) Pilot Valve will be de-energized
if module goes into lockout condition. Reset system by turning electrical
power off or by turning system controller down below "call for heat". Wait
one minute then turn system on.
Turn off power supply.
NO
Is high voltage cable assembly firmly plugged into module?
Is pilot ground wire firmly attached to the pilot assembly and GND
terminal on module?
NO
Are high voltage cable and ground wire in good condition (not brittle,
burnt or cracked)?
Make sure pilot flame spreader (hood) is the closest metal to
the electrode to prevent the spark from shorting out to other metal parts
(pilot screen, pilot shield, etc).
NO
High voltage cable must not touch metal surfaces or current carrying
wires.
Is there a 7/64" spark gap between the tip (edge) of the hood and
electrode, and is the gap located in the pilot gas stream?
NO
Is the ceramic insulator surrounding the electrode in good
condition (not cracked or broken)?
36
YES
YES
YES
YES
YES
YES
YES
Replace pilot burner assembly.