A.O. Smith Burkay HW-300, User Manual

20

CHECKING HONEYWELL S8600H OR S-8600M 

INTERMITTENT IGNITION CONTROLS 

NO SPARK AT PILOT BURNER BUT PILOT WILL NOT LIGHT

Turn off gas supply.

Is there a good connection between terminals?

Is module securely attached to boiler for good ground 

connection?

Is voltage (24VAC) across transformer positive terminal and 

GND with "call for heat"? 

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 on gas supply and/or 

power supply.

Turn off power supply.

Is high voltage cable assembly firmly plugged into module?

Is pilot ground wire firmly attached to the pilot assembly and 

GND 

terminal on module?

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).

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?

Is the ceramic insulator surrounding the electrode in good 

condition (not cracked or broken)?

Replace pilot burner assembly.

YES

YES

YES

YES

YES

YES

NO

NO

NO

NO

NO

Check the circuit providing

24 VAC.

Replace ignition module.

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.

NO

Fix connection and/or

tighten module to the

boiler.

YES

NO