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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

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 re-connect, replace or

repair as necessary.

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 shut-off valve is closed.

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 shut-off valve.

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” w.c.-14.0”w.c. LP; 11.0”
w.c.-14.0”w.c.

6. Call qualified gas technician.

PILOT

OFF

PILOT

ADJ

TPTH

OFF

PILOT

Pilot/Main Con-
trol

Piezo Ignitor

Regulator

Piezo Igni-
tor

Pilot/Main Control

ST120

Fig. 27 JUVS Honeywell Control Valve Assembly.

Fig. 28 JUVS SIT Control Valve Assembly.