A.O. Smith HW 300 Instruction Manual page 33

CHECKING HONEYWELL S-8600H OR S-8600M
INTERMITTENT IGNITION CONTROLS
Replace ignition module.
Turn on gas supply.
Turn on power supply.
Securely connect cable
and/or ground wire.
Replace pilot burner
and/or ground wire.
Carefully bend downward
top of ground strap
to achieve 1/8"
spark gap.
Replace Ignition
Module.
NO SPARK AT PILOT BURNER
Turn off gas supply.
NO
Is voltage (24 Vac) across the 24 V terminals
on module during "Call for heat"?
Is voltage (24 Vac) across the PV & MV/PV terminals on
"call for heat"?
NO
NOTE: S-8600M will automatically reset every 5 minutes. S8600H pilot
valve will be de-energized if module goes into lockout condition. Reset
system by turning electrical power off or by turning system controller to
off or down below "call for heat". Wait one minute, then turn system on.
Is ignition cable firmly plugged into pilot
NO
assembly and module?
Is ground wire firmly attached to pilot assembly and GND terminal
on module?
NO
Are ignition cable and ground wire in good condition
(not brittle, burnt or cracked)?
Ensure ground strap is the closest metal to the igniter/sensor
rod (electrode) to prevent the spark from shorting out to other metal
parts (pilot screen, pilot shield, etc.).
NO
Ignition cable must not touch metal surfaces or current
carrying wires.
Is there a 1/8" gap between ground strap and electrode?
NO
Is the ceramic insulator surrounding the electrode cracked or broken?
Replace pilot burner assembly.
33
YES
YES
YES
Turn off power supply.
YES
YES
YES
YES