18
NVB Series B-Vent Gas Fireplace
7412950
FP649
• Turn gas supply off
• Turn ON/OFF Switch
to call for heat.
NO
NO
NO
NO
NO
NO
NO
Spark across
Ignitor Sensor gap
Power to module
(24V nominal)
YES
YES
YES
YES
YES
YES
YES
• Turn gas on
Pilot burner lights?
Spark stops when pilot
is lit?
Main Burner lights?
• Replace Module
START
• Line Voltage (120VAC)
• Low Voltage Transformer
(19.5 minimum VAC)
• ON/OFF Switch
• Wiring connections
• Thermodisk
• Check continuity of ignition cable and ground wire.
• Clean flame rod.
• Check electrical connections beween flame rod and module.
• Check for cracked ceramic flame rod insulator.
• Check that pilot flame covers flame rod and is steady blue.
• Adjust pilot flame.
• If problem persists, replace module.
Unplug Ignition Lead
and check spark
at module
(24VAC nominal)
Spark OK?
• Check ignition cable, ground wiring, Ceramic Insulator and gap. Correct as necessary
• Check boot of ignition cable for signs of melting or buckling. Take protective
actions to shield cable and boot from excessive temperatures.
• Check for 24VAC 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 continuity of igniton cable and ground wire. NOTE: If ground is poor or
erratic, shutdowns may occur occasionally even though operation is normal
at time of checkout.
• Check that the pilot flame covers flame rod and is steady and blue.
• If checks are okay, replace module.
Troubleshooting
Ends
• 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 24VAC across PV-MV/PV terminals on module. If voltage is okay, replace
gas control. If not, replace module.
NOTE: If S8600B goes into lockout, reset system.
NOTE: If S8600B goes into lockout, reset system.
CHECK
:
System runs until
ON/OFF switch is in
"OFF" position
FP649 Honeywell S8600B T-shoot Guide 5/5/98
Troubleshooting
Remove glass panel before servicing.
NOVA SIT 822 with Honeywell S8600 B Electronic Ignition
f i r e - p a r t s . c o m
