A.O. Smith GDV - Drip From Relief Valve; Thermostat Fails to Shut Off; Combustion Odors; Smoking and Carbon Formation (Sooting)

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PROBLEM POSSIBLE CAUSE(S) CORRECTION
DRIP FROM RELIEF VALVE
Excessive water pressure
Heater stacking
Closed water system
Temperature setting too high
1.
2.
3.
4.
Use a pressure reducing valve and relief
valve
Lower the thermostat setting
See “Closed System/Thermal Expansion”
Decrease the temperature setting
1.
2.
3.
4.
THERMOSTAT FAILS TO
SHUT OFF
Defective gas control/thermostat
Improper calibration
1.
2.
Replace gas control/thermostat
Replace gas control/thermostat
1.
2.
COMBUSTION ODORS
Insuffi cient secondary air
Flue clogged
Heater installed in a confi ned area
1.
2.
3.
Provide ventilation to water heater. Check
fl ue way, fl ue baffl e, burner
Clean, locate source and correct
Provide fresh air ventilation
1.
2.
3.
SMOKING AND CARBON
FORMATION (SOOTING)
Insuffi cient secondary air
Low gas pressure
Flue clogged
Defective gas control/thermostat
Heater installed in a confi ned area
Burner fl ame yellow-lazy
1.
2.
3.
4.
5.
6.
Provide ventilation to water heater. Check
fl ue way, fl ue baffl e, burner
Check with gas utility company
Clean, locate source and correct
Replace gas control/thermostat
Provide fresh air ventilation
See “Burner Flame Yellow-Lazy”
1.
2.
3.
4.
5.
6.
CONDENSATION
Temperature setting too low
Water heater too small
1.
2.
Increase the temperature setting
Install adequate size heater
1.
2.
BURNER FLAME FLOATS
AND LIFTS OFF PORTS
Orifi ce too large
High gas pressure
Flue clogged
Cold drafts
1.
2.
3.
4.
Replace with correct orifi ce
Check with gas utility company
Clean fl ue and burner-locate source & cor-
rect
Locate source and correct
1.
2.
3.
4.
BURNER FLAME TOO HIGH Orifi ce too large1. Replace with correct orifi ce1.
FLAME BURNS AT ORIFICE
Defective gas control/thermostat
Low gas pressure
Orifi ce not properly installed
1.
2.
3.
Replace gas control/thermostat
Check with gas utility company
Reinstall the orifi ce
1.
2.
3.