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Flame too large 1. Defective operator section of gas valve. 1. Replace complete valve.
2. Burner orifice too large. 2. See orifice chart to determine the correct orifice size
for your Model Number and elevation.
3. Pressure regulator malfunction. 3. Regulator must be adjusted by a qualified serviceman
using proper tools and instruments.
Noisy Flame 1. Noisy pilot. 1. Reduce pilot gas with adjusting screw on combination
gas. (Fig. 1).
2. Burr in orifice (if it whistles or resonates). 2. Remove burr or replace orifice (Do not enlarge orifice).
3. Excessive gas input. 3. See “Flame Too Large”, above.
Yellow tip flames (Some 1. Clogged main burner ports. 1. Clean main burner ports (Do not enlarge ports).
yellow tipping on LP Gas 2. Clogged draft hood. 2. Clean draft hood.
is permissible) 3. Linted up air shutter. 3. Check for dust or lint at air mixer opening and around
the shutter.
Floating Flame 1. Blocked venting. 1. Clean flue passageways to relieve blockage.
Gas Odor 1. Chimney or flue obstruction. 1. Clean flue.
2. Drafts around heater. 2. Eliminate drafts.
3. Gas leak. 3. Shut off gas service immediately. Check piping. Call
gas company. See “For Your Safety” (Page 1), and
“Gas Supply” (Page 3).
Delayed Ignition 1. Pilot flame too small. 1. Check pilot orifice, clean, increase pilot gas flow if
necessary by adjusting at combination control valve
(Fig. 1).
2. Burner ports clogged near pilot. 2. Clean burner ports (do not enlarge ports).
3. Low gas pressure. 3. Check gas supply pressure. See “Gas Supply”.
4. Pilot decreases in size when main 4. Supply piping is inadequately sized. Consult local gas
burners come on. utility or competent installer.
5. Drafts around unit. 5. Eliminate drafts.
6. Pilot lighter door open causing 6. Close pilot lighter door.
disturbance of pilot flame.
7. Improper venting. 7. See “Venting” (Page 2).
8. Pressure regulator malfunction. 8. Regulator must be adjusted by a qualified serviceman
using proper tools and instruments.
Failure to ignite 1. Main gas off. 1. Open all manual gas valves.
2. Defective gas valve. 2. Replace gas valve.
Condensation of 1. Improper venting. 1. See “Venting”.
water vapor.
Burner won’t turn off 1. Defective or sticking automatic valve. 1. Clean or replace valve.
2. Excessive gas pressure (The supply gas 2. To correct this situation contact the gas company
pressure must not exceed 1/2 psi or 14” supplying the gas. See “Gas Supply”.
water column).
Incorrect gas input 1. Gas input not checked. 1. Re-check gas input. See “Gas Supply”.
2. Clogged orifice. 2. Check orifices for clogging. If clogged, clean out the
hole carefully with a smooth wood toothpick. (Do not
in any way enlarge or distort it).
3. Pressure regulator. 3. Regulator must be adjusted by a qualified serviceman
using proper tools and instruments.
4. Thermostat capillary tube damaged. 4. Replace gas valve.
SYMPTOM POSSIBLE CAUSES CORRECTIVE ACTION
TROUBLE SHOOTING CHART for qualified serviceman - MAIN BURNER
TROUBLE SHOOTING CHART - POOR HEATING RESULTS
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