Vermont Castings Jefferson Vent Free Gas Heater
Troubleshooting
Follow these procedures in the order presented.
W A R N I N G
TURN OFF HEATER AND ALLOW TO COOL
COMPLETELY BEFORE SERVICING.
CONDITION | POSSIBLE CAUSE | SOLUTION |
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No spark at pilot when Ignitor is operated.
1.Ignition Electrode is disconnected from ignition wire, broken or incorrectly positioned.
2.Ignitor wire is broken.
3.Bad Piezo Ignitor.
1.Inspect and
2.Replace wire.
3.Replace Piezo Ignitor.
The Ignitor Electrode sparks, but Pilot does not light.
1.Gas supply is turned off or supply line
2.Control Knob is not in PILOT position.
3.Control Knob not pressed in while in PILOT position.
4.Air present in gas lines.
5.Inlet supply pressure is not within correct settings.
6.Other conditions that should be identified only by a qualified gas technician.
1.Turn on gas supply or open supply line
2.Turn Control Knob to PILOT.
3.Press Control Knob in while in the PILOT position.
4.Continue holding in Control Knob and repeat ignition procedure until air is bled from the lines.
5.Call local gas supplier. Adjust inlet supply pressure to specification: NG; 5.5”
6.Call qualified gas technician.
Pilot/Main Con- trol
ADJ | PILOT |
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OFF
ON
PILOT
Piezo Ignitor
Regulator
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Piezo Igni- | Pilot/Main Control |
tor |
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LO 
PILOT
OFF
HI
ST120
Fig. 27 JUVS Honeywell Control Valve Assembly. | Fig. 28 JUVS SIT Control Valve Assembly. |
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