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Page 3917375-6-0705
INTERMITTENT PILOT TROUBLESHOOTING (continued)
S8600H TROUBLESHOOTING GUIDE
Note:
Before troubleshooting, familiarize yourself with
the startup
and checkout procedure.
Check line voltage power
, low voltage transformer limit control,
thermostat
and wiring.
Pull ignition
lead and
check spark
at ignition
stud.
Spark okay?
Replace module.
No
•
Check that all manual gas valves are 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 is okay, replace gas control. If not, replace module.
Note: If S8600H goes into lockout, reset system.
Check continuity
of ignition cable and ground wire.
Check
that pilot flame covers electrode.
Adjust pilot flame current. Minimum signal should read 1.0
microamp.
If problem persists, replace module.
• 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 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.
Note: If S8600H goes into lockout, 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.
If checks are okay, replace module.
Check for proper thermostat operation.
Remove MV lead
at module: If valve closes, recheck
thermostat
and wiring. If not, replace gas control.
No
No
No
No
No
No
No
Repeat procedure until troublefree operation
is obtained.
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
Ye
s
START
Turn gas supply off
Turn thermostat to
call
for heat.
Spark stops when
pilot is lit?
Power to module.
(24VAC nominal)
Spark across
ignitor/sensor
gap.
Turn gas supply on.
Pilot burner lights?
Main burner lights?
System runs until
call
for heat ends?
Call for heat ends.
System shuts off?
Troubleshooting ends.