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