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PROBLEM POSSIBLE CAUSE(S) CORRECTIVE ACTION
THERMOSTAT FAILS TO Thermostat not functioning properly 1. Replace thermostat
SHUT-OFF Improper calibration 2. Replace thermostat
COMBUSTION ODORS Insufficient secondary air 1. Provide ventilation to water heater. Check flue
way, flue baffle, and burner
Water heater flue or vent system 2. Clean, locate source and correct
blocked
Heater installed in a confined area 3. Provide fresh air ventilation
Insufficient secondary air
SMOKING AND CARBON
FORMATION (SOOTING)
1,
2.
1.
2.
3.
1.
2.
3.
4.
5.
6.
1.
Low gas pressure
Water heater flue or vent system
blocked
Thermostat not functioning properly
Heater installed in a confined area
Burner flame yellow-lazy
1. Provide ventilation to water heater. Check flue
way, flue baffle, burner
2. Check with gas utility company
3. Clean, locate source and correct
4. Replace thermostat
5. Provide fresh air ventilation
6. See "Burner Flame Yellow-Lazy"
CONDENSATION Temperature setting too low 1. Increase the temperature setting. Refer to the
"Condensation" sub-section of this manual's
Troubleshooting Guide.
BURNER FLAME FLOATS 1. Orifice too large 1. Replace with correct orifice
AND LIFTS OFF PORTS 2. High gas pressure 2. Check with gas utility company
3. Water heater flue or vent system 3. Clean flue and burner-locate source and correct
blocked
4. Cold drafts 4. Locate source and correct
BURNER FLAME TOO HIGH 1. Orifice too large 1. Replace with correct orifice
FLAME BURNS AT ORIFICE 1. Thermostat not functioning properly 1. Replace thermostat
2. Low gas pressure 2. Check with gas utility company
PILOT FLAME 1. Pilot line or orifice clogged 1. Clean, locate source and correct
TOO SMALL 2. Low gas pressure 2. Check with gas utility company
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