Part # MCOSM06 Rev 1 (11/03/08) Page 29
NO
NO
NO
NO
NO
NO
NO
NO
START
YES
YES
YES
YES
YES
YES
YES
YES
Note: Before trouble shooting familiarize yourself with
the startup procedure.
TURN GAS SUPPLY OFF.
TURN CONTROLLER TO
CALL FOR HEAT POWER
TO MODULE
(24V NOMINAL)
SPARK ACROSS IGNITER/
SENSOR GAP
TURN GAS SUPPLY ON
PILOT BURNER LIGHTS?
SPARK STOPS WHEN
PILOT IS LIT?
MAIN BURNER LIGHTS?
SYSTEM RUNS UNTIL
CALL FOR HEAT LOSS?
TROUBLE SHOOTING
ENDS
CALL FOR HEAT ENDS
SYSTEM SHUTS OFF?
Check line voltage power, low voltage transformer, limit controlled and wiring.
•Checkignitioncable,groundwire,cerami cinsulatorandgapandcorrect.
•Checkbootoftheignitioncablefo rsignsofmeltingorbuckling.Takeprotectiveactiontoshield
cable and boot from excess temperature.
•Onmodelswithvent damperplug,makesure ventdamper
had not be installed, the remove. Replace vent damper if
necessa ry.
•Onothermodels,replacemodule
Pull ignition lead
and check spark and
module.
Spark okay?
•Checkthatallmanualgasvalvesareopen,supplytubingandpressurearegood,andpilotburner
orice is not blocked.
•Checkelectricconne ctionsbetweenmoduleandpilotop eratorongascontrol.
•Checkfor24VACacrossPV-MV/PVterminalson module.Ifvoltageisok ay,replacegascontrol;if
not, replace module.
Note: If S5800B, H; S6810B, H goes into lockout, reset system. For S6800M, wait 6 minutes nominal
for retry or reset system
•Checkcontinuityofignitioncabl etogroundwire.
•Cleanamerod.
•Checkelectricalconn ectionbetweenamerodandmo dule.
•Checkforcrackedceramicamerodinsulator.
•Checkthatthepilotamecoverstheroadandiss teadyandblue.
•Adjustpilotame.
•Ifproblempersists ,replacemodule.
Note: If S8600B, H; S6810B, H goes into lockout, reset system. For S6800M, wait 6 minutes, nominally
for retry or reset system.
•Checkcontinuityofignitioncabl eandgroundwire.
Note. If ground is poor or erratic, shutdowns may occur occasionally even though o peration is
normal at the time of checkout.
•Checkthatthepilotamecoversamerodandiss teadyandblue.
•Ifchecksareokay,replacethemodule.
•Checkfor24VACacrossMV-MV\PVterminals.Ifnovoltage,replacem odule.
•Checkelectricalconnec tionsbetweenmoduleandgascontrol.Ifokay,replacegascontrolorgas
control operator.
•Checkforpropercontrollerop eration
•RemoveMVleadatmodule;ifvalvecloses,recheckthetempe raturecontrollerandwiring;ifnot,
replace gas control.
Repeat procedure until trouble free operation is obtained.
TROUBLE SHOOTING TABLE