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TROUBLESHOOTING CHART ( FOR QUALIFIED SERVICE TECHNICIAN ) -
MAIN BURNER
Please follow the following corrective actions in order.
SYMPTOM
POSSIBLE CAUSES
CORRECTIVE ACTION
Flame Too
Large
1. Defective operator section of gas
valve.
2. Burner orifice too large.
3. If installed above 2,000 ft.
1. Replace complete valve.
2. Check with local gas company for proper orifice size and replace.
3. Refer to orifice chart on Page 11.
1. Noisy pilot.
2. Burr in orifice
(If it whistles or resonates).
3. Excessive gas input.
Noisy Flame
1. Reduce pilot gas with adjusting screw on combination gas control valve.
2. Remove burr or replace orifice
(do not enlarge orifices).
3. See “Flame Too Large” above.
1. Clogged main burner ports.
2. Clogged draft hood.
3. Linted up mixer opening.
Yellow Tip Flame
(Some yellow
tipping on Propane
gas is permissible).
1. Clean main burner ports.
(Do not enlarge ports).
2. Clean draft hood.
3. Check for dust or lint at air mixer opening.
1. Blocked venting.
Floating
Flame
1. Clean flue passageways to remove blockage.
1. Gas leak.
2. Chimney or flue obstruction.
3. Drafts around appliance.
Gas
Odor
1. Shut off gas service immediately. Check piping. Call gas company. See “For Your
Safety”, Page 1.
2. Clean flue.
3. Eliminate drafts.
1. Pilot flame too small.
2. Burner ports clogged near pilot.
3. Low gas pressure.
4. Pilot decreases in size when main
burners come on.
5. Drafts around appliance.
6. Bad venting.
Delayed
Ignition
1. Check pilot orifice. Increase pilot gas flow if necessary by adjusting inlet pressure from
gas source
(meter if natural gas or second stage regulator if propane - maximum 7” w.c.
for Natural and 11” w.c. for propane).
2. Clean burner ports
(do not enlarge ports).
3. Check gas supply inlet pressure. Check gas outlet
(manifold)
pressure for “minimum
step” pressure
(for “step” pressure chart see “Operation”)
.
4. Supply piping inadequately sized or incorrect inlet pressure.
5. Eliminate drafts.
6. See “Venting”.
1. Gas input not checked.
2. Clogged orifice.
Incorrect
Gas Input
1. Re-check gas input.
2. Check orifice for clogging. If clogged, clean out the hole carefully with a smooth wood
toothpick.
(Do not in any way enlarge or distort it).
1. Main gas off.
2. Defective gas valve.
Failure to
Ignite
1. Open all manual gas valves.
2. Replace gas valve.
1. Appliance undersized.
2. Incorrect supply pressure.
Not Enough
Heat
1. This is especially true when a dwelling or room is enlarged. Have the heat loss calculated
and compare to the appliance output
(approx. 70% of input)
. Your gas company or
installer can supply you with this information. If appliance is undersized, replace with
correct size unit.
2. Check supply pressure as outlined above.
1. Defective or sticking automatic valve.
2. Excessive gas pressure
(The supply gas pressure must not
exceed 1/2 PSI or 14” W.C.)
Burner Won’t
Turn Off
1. Replace valve.
2. To correct this situation contact the utility supplying the gas.
1. Improper venting.
Condensation of
Water Vapor
1. See “Venting”.
1. Combination control valve
sticks open.
Too Much
Heat
1. Replace combination control valve.
