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17m
Vermont Castings Jefferson Vent Free Gas Heater
Troubleshooting
cont’d.
CONDITION POSSIBLE CAUSE SOLUTION
Pilot lights but flame goes out
when Control Knob is released.
1. Control Knob not fully depressed
or held in long enough.
2. Gas supply line shut-off valve is
not fully open.
3. Thermocouple connection is loose
at the Control Valve.
4. Pilot flame does not touch the
Thermocouple. (Figs. 29, 30)
This can be caused by:
A) Incorrect gas pressure, and/or
B) other conditions that should be
identified only by a qualified
service technician.
5. Thermocouple is damaged.
6. Control Valve is damaged.
1. Depress Control Knob fully and
hold in for a full 30 seconds.
2. Fully open gas supply line shut-off
valve.
3. Inspect and tighten securely.
4. A) Contact the local gas company.
Inlet supply pressure should be 5”
w.c.-8”w.c. for NG (5”w.c.-7”w.c.
over 8000 ft. elevation) and
11”w.c.-12”w.c. for LP. Adjust as
necessary.
B)Call local gas service techni-
cian.
5. Call local gas service technician.
6. Call local gas service technician.
Fig. 31 Correct LP Pilot Flame.
Fig. 32 Correct NG Pilot Flame.
Pilot lights but Main Burner does
not.
1. Gas supply line shut-off valve is
not fully open.
2. Foreign material is blocking
Burner ports.
3. Main Burner orifice is clogged.
4. Thermostat or remote switch not
activated on JUVS.
5. Bad Thermopile.
1. Fully open gas supply line shut-off
valve.
2. Insptect and clear debris away
from Burner ports.
3. Call local gas service technician.
4. Set thermostat to higher tempera-
ture or check remote switch.
5. Call local gas service technician.
Main Burner shuts off and Pilot
flame goes out while in operation.
1. Insufficient fresh air.
2. Incorrect inlet supply pressure.
1. Determine that adequate ventila-
tion exists to provide sufficient
fresh air. Open a window or
provide additional ventilation. (See
Fresh Air Requirements, Pages 6-
7)
2. Contact the local gas company.
Adjust inlet supply pressure to
specification: NG; 5”w.c.-8”w.c.
(5”w.c.-7”w.c. at elevations over
8000 ft.) LP; 11”w.c.-12”w.c.
Fig. 30 Pilot flame is weak - does not
touch Thermocouple.
Fig. 29 Pilot flame is lifting.
Thermopile
Thermo-
couple