A.O. Smith High Efficiency 100 series Installation Instructions Manual page 30

INSUFFICIENT HOT WATER 1.
SLOW HOT WATER
RECOVERY
DRIP FROM RELIEF VALVE
THERMOSTAT FAILS TO
SHUT-OFF
COMBUSTION ODORS
SMOKING AND CARBON
FORMATION (SOOTING)
CONDENSATION
BURNER FLAME FLOATS
AND LIFTS OFF PORTS
BURNER FLAME TOO HIGH 1.
FLAME BURNS AT ORIFICE
PILOT FLAME
TOO SMALL
SMELLY WATER
Thermostat set too low
2. Sediment or lime in tank
3. Water heater too small
4. Wrong piping connections
5. Leaking faucets
6. Wasted hot water
7. Long runs of exposed piping
8. Hot water piping in outside wall
9. Low gas pressure
1. Insufficient secondary air
2. Flue clogged
3. Low gas pressure
4. Improper calibration
5. Water heater too small
6. Wasted hot water
1. Excessive water pressure
2. Heater stacking
3. Closed water system
1. Thermostat not functioning properly
2. Improper calibration
1. Insufficient secondary air
2. Flue clogged
3. Heater installed in a confined area
1. Insufficient secondary air
2. Low gas pressure
3. Flue clogged
4. Thermostat not functioning properly
5. Heater installed in a confined area
6. Burner flame yellow-lazy
1. Temperature setting too low
1. Orifice too large
2. High gas pressure
3. Flue clogged
4. Cold drafts
Orifice too large
1. Thermostat not functioning properly
2. Low gas pressure
1. Pilot line or orifice clogged
2. Low gas pressure
1. Sulfides in the water
1. Turn temperature dial to desired setting
2. Drain/flush-provide water treatment if needed
3. Install adequate heater
4. Correct piping-dip tube must be in cold inlet
5 Repair faucets
6. Advise customer
7. Insulate piping
8. Insulate piping
9. Check with gas utility company
1. Provide ventilation to water heater. Check flue
way, flue baffle, and burner
2. Clean flue, locate source and correct
3. Check with gas utility company
4. Replace thermostat
5. Install adequate heater
6. Advise customer
1. Use a pressure reducing valve and relief valve
2. Lower the thermostat setting
3. See "Closed System/Thermal Expansion"
1. Replace thermostat
2. Replace thermostat
1. Provide ventilation to water heater. Check flue
way, flue baffle, and burner
2. Clean, locate source and correct
3. Provide fresh air ventilation
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"
1. Increase the temperature setting
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
1. Replace with correct orifice
1. Replace thermostat
2. Check with gas utility company
1. Clean, locate source and correct
2. Check with gas utility company
1. Replace the anode with a special anode
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