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SYMPTOM
Flame too large
Yellow
burner
flame
Gas Odor
Delayed
Ignition
Failure
to ignite
Burner
won't
turn off
Incorrect
gas input
Not enough
heat
TROUBLE
SHOOTING
CHART
i.
2.
3.
i.
1.
2.
3.
4.
2.
3.
4.
POSSIBLE
CAUSES
Defective
operator
section
of valve,
i.
Burner
orifice
too large.
2.
If installed
above 2,000 feet.
3.
Clogged
burner
ports.
1.
Obstructions
around
vent cap.
2.
Gas leak.
i.
Pilot flame too small.
I.
Burner
ports clogged
at pilot.
2.
Low gas pressure.
3.
Pilot decreases
in size when main
4.
burners
come on.
Main gas off.
i.
Thermostat
not set high enough
to call
2.
for heat.
Clogged
burner
orifice.
3.
Thermostat
wired wrong
or defective.
4.
Defective
or damaged
thermostat
wire,
1.
or themmstat.
Thermostat
location.
2.
Defective
or sticking
valve.
3.
Excessive
gas pressure.
4.
I. Gas input not checked.
2. Clogged orifice.
i. Furnace undersized.
2. Thermostat set too low.
3. Incorrect supply pressure.
CORRECTIVE
ACTION
Replace
valve.
Check
with local gas company
for proper
orifice
size and replace.
See orifice chart, page 10.
Remove
main burner
and check
for obstructions
in
throat,
ports, and orifices.
Clean
- but do not enlarge
ports or orifices.
Make sure area around
vent cap is clear, be sure
vent system
is sealed.
See Page
1.
Adjust pilot flame.
Clean burner ports (do not enlarge).
Check gas supply pressure.
Supply piping is too small. Consult local gas
company or competent installer.
Open all manual gas valves.
Set thermostat to higher temperature.
Clean burner
orifice
(do not enlarge).
Check wiring,
jump
across
thermostat
terminals
at
valve, if valve
open, re-check
wires,
replace
thermostat.
Can be checked
by removing
wire from valve temlinal.
If valve
goes of'f, replace
wire or thermostat.
Follow
instructions,
check location.
Replace
valve.
Contact
utility supplying
gas.
i. Re-check gas input.
2. Clean orifice with a smooth wood toothpick,
do not enlarge.
I. This is especially
true when a dwelling
or room is
enlarged.
Have the heat loss calculated
and
compare
to furnace
output.
Your gas company
can
supply you with this information.
If furnace
is
undersized,
replace
with correct
size unit.
2. Raise
temperature
setting.
3. Check
supply pressure.
Too nmch heat
i. Thermostat
set too high.
I. Lower
temperature
setting.
2. Combination
control
valve stuck open.
2. Replace
combination
control
valve.
1. Weak thennocouple.
2. Input too high.
3. Cover around
pilot lighter
hole not
air tight.
4. Vent robes not properly
installed
or
sealed.
Pilot and main burner
go out during
normal
operation
1. Check millivoltage
and replace
if low.
2. Check
input rate.
3. Tighten
wing nuts securing
cover
and sight
glass.
Check and replace
gasket
if needed.
4. Follow
instructions.
Check
both exhaust
and air
intake robes, and vent cap.
Be sure all gaskets
are
in place and properly
sealed.
Use only tubes and
vent cap supplied.
Do not alter vent tubes or cap.
Page 16
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