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S8600, S8610 TROUBLESHOOTING GUIDE
NOTE: Before troubleshooting, familiarize yourself with the start up and checkout procedure.
Check line voltage power, low voltage transformer, limit controller, thermostat (controller) and
wiring. Also, check air proving switch on combustion air blower system (if used) and that vent
damper (if used) is open and end switch is made.
Pull ignition lead and
check spark at module
Spark okay?
• Check ignition cable, ground wiring, ceramic insulator and gap, and correct.
• Check boot of the ignition cable for signs of melting or buckling. Take protective
action to shield cable and boot from excessive temperatures.
• Check that all manual gas valves ar open, supply tubing and pressures are good, and pilot
burner orifice is not blocked.
• Check electrical connections between module and pilot operator on gas control.
• Check for 24 Vac across PV-Mv/PV terminals on module. If voltage if okay, replace gas
control; if not, replace module.
NOTE: If S8600B, H; S8610B, H goes into lockout, reset system. For S8600M, wait 6 min.
norm. for retry or reset system.
• Check continuity of ignition cable and ground wire.
• Clean flame rod.
• Check electrical connections between flame rod and module.
• Check for cracked ceramic flame rod insulator.
• Check that pilot flame covers flame rod and is steady and blue.
• Adjust pilot flame.
• If problem persists, replace the module.
NOTE: If S8600B, H; S8610B, H goes into lockout, reset system. For S8600M, wait 6 min.
norm. for retry or reset system.
• Check continuity of ignition cable and ground wire.
NOTE: If ground is poor or erratic, shutdowns may occur occasionally even though operation
is normal at the time of checkout.
• Check that pilot flame covers flame rod and is steady and blue.
• If checks are okay, replace the module.
• Check for 24 Vac across MV-MV/PV terminals. If no voltage, replace module.
• Check electrical connections between module and gas control. If okay, replace gas control
or gas control operator.
• Check for proper thermostat (controller) operation.
• Remove MV lead at module; if valve closes, recheck temperature controller and wiring; if
not, replace gas control.
• On modules with vent damper plug, make sure
vent damper has not been installed, then
removed. Replace vent damper if necessary.
• On other models, replace module.
NO
NO
YES
START
TURN GAS SUPPLY OFF,
TURN THERMOSTAT
(CONTROLLER) TO CALL
FOR HEAT
POWER TO MODULE
(24V NOMINAL)
NO
SPARK ACROSS
IGNITER/SENSOR GAP
YES
YES
NO
TURN GAS SUPPLY ON
PILOT BURNER LIGHTS?
YES
NO
SPARKS STOP WHEN
PILOT IS LIT?
YES
NO
MAIN BURNER LIGHTS?
YES
NO
SYSTEM RUNS UNTIL
CALL FOR HEAT ENDS?
YES
NO
CALL FOR HEAT END
SYSTEM SHUTS OFF?
TROUBLESHOOTING
ENDS
Repeat procedure until trouble
free operation is obtained.
YES