A.O. Smith RESIDENTIAL GAS WATER HEATERS Installation And Operating Manual page 53

PROBLEM
CONDENSATION
COMBUSTION ODORS
SMOKING AND CARBON
FORMATION
UNABLE TO LIGHT
THE BURNER
SIZZLING, RUMBLING
NOISE
WATER LEAKAGE
BLOWER WILL
NOT START
POSSIBLE CAUSE(S)
1. Filling the new water heater for the fi rst
time
2. M o i s t u r e f r o m t h e p r o d u c t s o f
combustion
3. Water dripping from blower assembly
4. Undersized water heater
1. Air inlets blocked
2. Insuffi cient air
3. Flue clogged
4. Heater installed in a confi ned area
5. House too tight
1. Air inlets blocked
2. Insuffi cient air
3. Low gas pressure
4. Orifi ce too large
5. Flue clogged
6. Defective gas control valve/thermostat
7. Heater installed in a confi ned area
1. Air in gas line
2. Pressure switch
3. Blocked exhaust
4. Wire connection
5. Defective gas control valve/thermostat
1. Scale and sediment
2. Condensation dripping on burner
1. Condensation
2. Dripping Temperature & Pressure Relief
Valve
3. Drain valve dripping/leaking
4. Tank Leak
1. No power to unit
2. Thermostat set too low
3. Defective air pressure switch
4. Defective blower
5. Disconnected or loose wire
6. Control locked out
www.hotwater.com
CORRECTIVE ACTION
1. Normal operation: the condensation
should disappear after heater warms up
2. Normal operation: the condensation
should disappear in time
3. Install condensate hose to drain port on
the rubber coupling
4. Install adequate heater
1. Unblock inlet air openins
2. Provide fresh air ventilation to the water
heater
3. Clean, locate source and correct
4. Provide fresh air ventilation to the water
heater
5. Provide fresh air ventilation to the water
heater
1. Unblock inlet air openings
2. Provide ventilation to water heater.
Check fl ue way, fl ue baffl e and burner
3. Check with gas utility company
4. Replace with correct orifi ce (see rating
plate)
5. Clean, locate source and correct
6. Replace gas control valve/thermostat
7. Provide fresh air ventilation
1. Purge the air from gas line
2. Check the pressure switch, make sure
the pressure switch hose is not kinked
3. Check vent pipe for blockage
4. Check wire connections
5. Replace the gas control valve/
thermostat
1. Drain/flush-provide water treatment if
needed
2. Refer to "Condensate" section
1. Refer to "Condensate" section
2. Refer to "Temperature & Pressure Relief
Valve" section
3. Back fl ush to clean- out sediment, replace
if necessary.
4. Check "Leakage Checkpoints"
1. Plug in power cord, check fuses and/or
supply voltage
2. Turn temperature knob to higher setting
3. Replace air pressure switch
4. Replace blower
5. Repair and reconnect wires
6. Refer to "Resetting The Heater Control"
– determine cause of lockout
53