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1616
Vermont Castings Jefferson Vent Free Gas Heater
Troubleshooting
Follow these procedures in the order presented.
WARNING
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
ON
OFF
PILOT
ADJ
L
O
H
I
TPTH
TH
TP
HI
OFF
PILOT
LO
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.