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Vermont Castings UVS27 Vent-Free Gas Heater
20005004
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) Call local gas supplier. Adjust
inlet supply pressure to specifica-
tion: NG; 5.5” w.c.-14.0”w.c. LP;
11.0” w.c.-14.0”w.c.
B)Call local gas service techni-
cian.
5. Call local gas service technician.
6. Call local gas service technician.
Correct LP Pilot Flame.
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 tem-
perature 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. Call local gas supplier. Adjust
inlet supply pressure to specifica-
tion: NG; 5.5” w.c.-14.0”w.c. LP;
11.0” w.c.-14.0”w.c.
Pilot flame is weak - does not touch
Thermocouple.
Pilot flame is lifting.
Thermopile
Thermo-
couple
ST121a