Part # MCOSM06 Rev 1 (11/03/08) Page 29
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START
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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.
•Checkignitioncable,groundwire,cerami cinsulatorandgapandcorrect.
•Checkbootoftheignitioncablefo rsignsofmeltingorbuckling.Takeprotectiveactiontoshield
cable and boot from excess temperature.
•Onmodelswithvent damperplug,makesure ventdamper
had not be installed, the remove. Replace vent damper if
necessa ry.
•Onothermodels,replacemodule
Pull ignition lead
and check spark and
module.
Spark okay?
•Checkthatallmanualgasvalvesareopen,supplytubingandpressurearegood,andpilotburner
orice is not blocked.
•Checkelectricconne ctionsbetweenmoduleandpilotop eratorongascontrol.
•Checkfor24VACacrossPV-MV/PVterminalson module.Ifvoltageisok ay,replacegascontrol;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
•Checkcontinuityofignitioncabl etogroundwire.
•Cleanamerod.
•Checkelectricalconn ectionbetweenamerodandmo dule.
•Checkforcrackedceramicamerodinsulator.
•Checkthatthepilotamecoverstheroadandiss teadyandblue.
•Adjustpilotame.
•Ifproblempersists ,replacemodule.
Note: If S8600B, H; S6810B, H goes into lockout, reset system. For S6800M, wait 6 minutes, nominally
for retry or reset system.
•Checkcontinuityofignitioncabl eandgroundwire.
Note. If ground is poor or erratic, shutdowns may occur occasionally even though o peration is
normal at the time of checkout.
•Checkthatthepilotamecoversamerodandiss teadyandblue.
•Ifchecksareokay,replacethemodule.
•Checkfor24VACacrossMV-MV\PVterminals.Ifnovoltage,replacem odule.
•Checkelectricalconnec tionsbetweenmoduleandgascontrol.Ifokay,replacegascontrolorgas
control operator.
•Checkforpropercontrollerop eration
•RemoveMVleadatmodule;ifvalvecloses,recheckthetempe raturecontrollerandwiring;ifnot,
replace gas control.
Repeat procedure until trouble free operation is obtained.
TROUBLE SHOOTING TABLE